I don't see how Redknapp's article is at all controversial.
United were already crowded in the front with 5 players competing for 3 forward positions, but Rashford managed to get a lot of play , because Miki was **** and Zlatan is out. But with the arrival of Sanchez, the same 5 players will have to be competing for 2 positions, as Sanchez will expect to play almost every game (as he should). So that's Lukaku-Martial-Mata-Lingard-Rashford fighting it out to fill 2 remaining spots. Not exactly comfortable situation for a young player to say the least.