I didn't say you were building a title winning team. I said by gutting your team in a very short space of time relatively speaking you are now in a much stronger position. It's worked for Arsenal.
If only being left with Laca and Xhaka isn't gutting the squad then I misunderstand the meaning of the word gutting.
Arteta didn't gut "Half" the squad. He gutted almost the ENTIRE squad. There is no guarantee the team will be better after overhaul though, let alone short space of time. Too many new players integrated into the team all at once is risky. It really depends on the DOF and also the manager for recruitment and training. Credit to them. Even Arsenal fans are surprised by the progression as Arsenal is a very young team in transition.
Man Utd has the resource to overhaul the squad completely. No doubt about it. The hard part is always identify and recruit the right talent for the playing style of the team just like Barcelona did.
Back to Rashford, I just said he is/was talented as left wing inside forward and scored 19 goals 2 seasons in a row. I don't know what happened to him this season. if It is a motivation issue, confidence issue, injury or manager tactic not the best fit for him. Sancho took his position on the left now and he may have a hard time earn it back with his current form. I still remember the break out season he had with LVG in charge. Just like Auba for Arsenal, he is just not motivated anymore and he plays back to his level in barcelona.