The players you mentioned are ones he trusts and plays whenever they are available. The only bullshit thing is treating someone like Rashford as not one of his guys when he's indispensable for Ten Hag and played a huge role in us finishing top 4 and winning that cup last season, yet he's not "his player".
Clutching at straws, basically.
Also no, Scott playing isn't a squad rotation. He has been a main starter for about 2 months now while Mount and Amrabat are warming the bench for him despite being his main midfielders signings last summer. More like he realized his signings are crap and resorted back to Scott McTominay, which is ultimately Ten Hag's fault for choosing players to begin with. Scott starting ahead of Mount instead of him trying to play Mount into form like how he has been doing for Rashford since the season has started proves that in how own mind Ten Hag doesn't have any time it patience for Mount, his biggest signing last summer, to start performing. He's not forced to start McTominay.
He bought half of the current main lineup and the other half are mostly indispensable for him whenever they are available. You basically want the guy to come in and buy 11 new players that he picks in starting lineup and consider any player he didn't bought as being forced on him. That's pretty dumb way of thinking.
No manager will walk in and replace the entire team just to be "his team". Bring me examples of this?