Do you really see that as a risk? Sentimental attachment to players does not seem like an obvious concern with Mourinho.
Seems strange but it is arguably a weakness in my opinion. He is very ruthless when he comes into a new team.. and selects 'his players' who he thinks are going to be his men for the next three years. He shows them incredible loyalty in a way that Pep/SAF wouldn't.
It is the one quality that Pep has which trumps Jose (getting rid of Eto'o... now in hindsight it was a poor decision but it showed that even if a guy had won him a trophy, if he thought it was not going to help the team in the future.. he'd get rid), and the one quality which SAF possessed at his peak which arguably no other manager has managed to replicate hence why he was unique in being able to shred one team up and produce another. He knew exactly when to stop being loyal and get rid.. bring in someone better.
Jose builds a siege mentality and for 3 years, these players are like sons to him, he's their father/older brother/best friend rolled into one and he spoils the players to such a degree.. that he is then unable to see the wood for the trees when the same players backstab him or stop responding to his instructions.
Prime example being someone like John Terry in his first stint, then someone like Ivanovic in the second. He refused to be ruthless with Ivanovic and was weak in dropping players when standards were dropping, Hazard remained in the side for a while.. its only when the shit started hitting the fan, he started dropping players left right and centre but by this stage it had no impact.. the players felt there was nothing worth fighting for as results had gotten so bad and didn't care if they were dropped, they saw it as motivation to call for his head. Early detection of poor form/dropping players early doors would have kept the squad on their toes and wouldn't have led to the deeper malaise which resulted.
It can't have been very motivating to see Ivanovic picked week in week out despite being wretched. It might have led to the other players thinking Mourinho had gone soft or that his judgement was lacking. Then you add in the fight with Eva and it just looked like a guy desperately trying to inject some drama and life back into the team rather than addressing the actual issues within the side and calling the players out on their poor performances. He tried to shortcut his way into getting the team to play well.
Mourinho hasn't demonstrated that he has the stomach to rip apart a side of his own making and rebuild it. Then again, no modern manager has in all fairness and he hasn't managed in environments which could test this ability.. but what I will say is that I think a more hungrier Mourinho with a chip on his shoulder and freedom to manage exactly how he wants.. he'd be less attached to his players as before and be more ruthless and smarter in his dealing with players.
The Rooney saga.. I can imagine him thinking to himself, this is my dream job.. I want to annihilate Pep Guardiola.. is Rooney really going to help me with achieving that objective? hell no and he'd get rid without a moments hesitation. He knows he is in the last chance saloon, it is his big chance to nail his dream job and destroy his biggest rival - I can't imagine him being weak and pandering to club politics etc.