Seems he sometimes has problems managing certain individuals indeed. That said, I will not freakout if Bena leaves. I'm sure we can deal with it.
Allegri is an uber troll. Given that Benatia fucked up 2 times in important games i bet Allegri comes up with some puns every time he sees Benatia.
Benatia arrives to the training - Allegri says 'oh glad you didn't
miss your bus'

Benatia goes to the toilet - Allegri says 'oh nice that you reacted in the right time'

Allegri discusses our next opponent with the team ans says 'and remember not to fuck up in the last minutes like Benatia usually does'

Benatia signs an autograph for some old lady and Allegri says 'oh i believe she too jumps higher than you'
No wonder Benatia wants to leave, it becomes annoying to head those horrible puns all the time.
Allegri just like Dinesh here