We should be trying to get better. Dorgu's entire career as a left winger consists of a grand total of 3 good games. Our only other option there is Cunha who clearly doesn't look natural on the left wing, and we are only tolerating him there because we are winning. The fact you mentioned Amad and Lacey shows we are scraping the bottom of the barrel. We need a natural option there considering Dorgu may have to be our left back at some point too.
I completely agree that United "should be trying to get better". But what does that really mean on a position by position basis?
For example, all of us acknowledge that Senne Lammens has been brilliant for us. But none of us would argue that he's the greatest keeper on the planet. He probably not even on anyone's top ten keepers list. Under the operating theory that we should always try to get better does it therefore follow that we should seek to upgrade on Lammens? Of course not, right? Despite his youth and relative lack of experience -- is it even 20 games now for United? -- every one of us is on board with Lammens as our starting keeper going into next season. At least I believe that must be the case. Maybe I'm wrong.
The task ahead of management is to shore up areas of weakness in the squad and without any doubt whatsoever the area of primary concern is central midfield. There's no need to elaborate here on that point except to say that we need to bring in 2 (some here have argued 3, but I argue 2) midfielders. The outlay for two proper CMs, one being more B2B and the other being more CDM, is probably going to land somewhere around 120-140m. I could be wrong about this, but I don't think we're going to find diamonds in the rough for cheap for the CM positions as we did for Lammens, who cost us only 18m but who now is probably worth at least 60m.
We need a backup striker more than we need what has been argued as a real left-winger. That's an indisputable fact, but what I have no idea of how much we would need to spend to bring in a decent backup for Sesko. I'll just make up a number and say 30m.
So we're already going to spend let's say 150m to shore up areas of greater need. Let's just make up a number and say we're got another 50m left in the transfer account for a total of 200m (If my math is right I think we spent net 230m last summer for Sesko, Mbeumo, Cunha and Lammens.
By the way, we spent 62m for Cunha, whom some of us are now proposing to bench for a new LW who, if he's better than Cunha, will cost us at least another 62m. I'm not opposed to finding a diamond in the rough -- although to go off on a tangential point I don't want to spend too much time on right now, I don't want to block the path for JJ Gabriel in 2-3 years as he looks a sensational prospect (the kind of prospect we're all dreaming of) and is expected to join the first team next season, even if he gets only a few chances in competitive action with the first team -- for 15-20m, but what I think you mean is "getting better" than Cunha and my response to that Cunha has been fantastic for us since Amorim left and that even if we think he hasn't been good enough under Carrick I struggle with the logic of spending what would have to be at least 62m for an upgrade on a player, who's been fantastic for us, who cost us 62m.
And then there is Dorgu, who's more an attacking weapon than a defensive weapon. From time to time here we all opine about playing players out of their ideal position, such as Martinez as CDM, but that never really does make any sense. We did that with Bruno under Amorim and although it wasn't necessarily a disaster it really was a very bad idea and largely contributed to our malaise under Amorim. No, Dorgu should be developed as an attacking player and not a defender although in a late game situation or a severe injury crisis I have no problem shuffling Dorgu to the back line.
Let's focus on priority needs first before even thinking about going galactico.