What a terrible excuse, not together as a team. There have been way more dysfunctional teams which have been way more successful. Imagine if Griezmann started saying that about Barca or Hazard started saying that about Real Madrid. Top players are brought in to provide leadership, experience and to bring the team together - top players lead by example. It's easy to blame Mourinho for everything and he's definitely not made it easier for them, but Sanchez really should have stepped up instead of giving up and looking for a way out.
I'm glad we're seemingly more concerned about player mentality right now, because we've had some burnt fingers with ADM, Memphis, Lukaku and now Sanchez. Good riddance by Ole, Sanchez clearly couldn't deal with the pressure and was happy cashing in cheques for a year. He's now gone into the Lukaku mode of revisionism to protect himself, and I don't buy it. You had your chances, and your blew them all spectacularly.