It doesn’t matter whose on the bench, right now Fodden, Mahrez, Alvaro, Walker, Laport all squad players walk into our first 11.
When players who you call your starting 11 don’t perform like Casemeiro recently or Varane gets injured you need a suitable replacement who understand the system and want to play week in week out so they want to compete and this makes the squad improve. The idea of a 19/20 year old playing at the heart of the defence instead of Varane or KMJ who will be available at the half the cost is madness, unproven in PL still growing and developing into a top class CB, Kim Min Jae is the man for us and will relegate R Varane to 3rd Choice. I do like the idea of Caciedo becoming our J Timber style player though and he should be the second must have name on the transfer list after V Osimhen.
Don’t take my word for it, listen to what ETH has said on numerous occasions, the club needs 2 international players for every position. The system that you discuss, he was able to implement at Ajax, because the league had lots of week teams, they didn’t have a Bouremouth who were nailed on to go down at Xmas get bought by a billionaire and then spend £60-70m in a January window to improve out of site.
The PL is unforgiving and to Implement his version of 4-1-2-3 in the PL which becomes more like 3-2-2-3 in possession trying to pin the opposite team into their own half with lots of rotation, you need high energy as you need to dominate the ball and especially turn overs, you can’t have a player like Antony or Sancho in the starting 11 as they don’t offer the stats so you need to be ruthless in chances created, which means you need more contributions of goals, more goals from the bench when players are tired to enforce that early domination.
It's exactly why City have been successful by focusing on improving the first 11, which has created competition for places and the likes of Mahrez, Alvarez, Walker etc have become good rotation options. But they've improved the first 11 by feeding the idea of their head coach and signing players who fit into that idea.
When players like Casemiro are out of form or need resting, then Caicedo is switched from his inverted fullback role and is utilised in a deeper central midfield role and Dalot comes off the bench to take up the RB spot. And Antonio Silva at 19/20, has all the attributes to be a very good fit for a team who want to exert, zonal and positional control in possession, and Silva imo has bigger potential than a Kim Min Jae when it comes to evading and resisting pressure against the teams who press aggressively due to Antonio Silva being of a higher technical level. Antonio Silva rotated with Varane would ideally be the better mid to long-term plan for the system to come to fruition imo.
Whether Erik ten Hag wants a big squad or not isn't the question. What he's said on numerous occasions is wanting to buy the correct profile of player that fits into his system. And his system/idea is the same or very similar to the systems at City, Arsenal, Liverpool and Brighton with a few differences between them. So it's not about the weak Dutch league but rather about implementing a system/style of play which is currently dominating the EPL. The two teams currently fighting for the league implement the same system, and positional play first appeared on the world stage via the Dutch league (Rinus Michels/Ernst Happels). And coordinated pressing in a high, mid or low block is said to have taken off at Feyenoord under their former head Coach, Ernst Happels. The idea has been tweaked over the decades but the idea has stood the test of time.
I've been reading your posts in this thread for a while and you've brought up things like United not scoring enough goals in the last 10 years, which I agree with. And that there is the problem that hasn't been rectified in a league which became more technical in the last 10 years with the influx of many deeper thinking head coaches who have brought forth and implemented, proactive attacking ideas, which we haven't been able to adapt to.
So the answer to why we haven't been able to score enough goals or implement a proactive attacking playstyle is very simple imo. The answer isn't to sign two strikers but rather to improve the technical level of the players occupying positions in the defensive third of the pitch, which would allow us to build play more effectively against teams who are adept at pressing high. And if we can resist and evade pressure consistently in the defensive third, we will in-turn be able to sustain pressure in the opponent's half by keeping a high line, compressing the pitch which will open up the potential for us to effectively press high up the pitch with the back 5 supporting the front 5 by closing off the space. And that's how you create a proactive attacking team by having technically strong first phase players and the rest will then follow, where the collective team unit will create chances due to playing the game in the opponent's half.
We need a striker but the rest of the money needs to be spent on raising the technical of the players in the first phase of the build up. Because that's our biggest weakness and has been for a decade. Or else we'll see the same repeated about how the keeper or fullback are saving us due to their saves and tackles, when in reality we can't build up play effectively through the thirds due to the same players, which means we surrender possession frequently and have to defend more than we attack against any decent team who looks to press us high. That then has a knock on effect on the attacking players due to the weak foundations behind them.