Its always hard to define a true first 11, but if you look at the team that beat City away in the season when we finished 2nd, one of the high points of Mourinho's time at United, we started with De Gea, Valencia, Bailly, Smalling, Young, Matic, Pogba, Herrera, Lingard, Sanchez and Lukaku. 6 of those players are now gone (or almost gone in the case of Sanchez and Smalling). Of the 25 players with 10 more appearances that season, 11 have already left or are probably going this summer, Mata and Rojo being those likely to leave. That's some pretty serious churn in just two seasons, I dont think you can argue that the composition of the first team squad hasn't changed pretty substantially since Ole came in.