Mourinho is just a coward in the big games sadly, it's his biggest weakness. His first priority is don't lose. It can be effective but it is boring as **** to watch.
This is really the problem imo, he is a coward, and his teams become cowardly. If you rock up to all the big games telling your players essentially I don't trust you to play your game, you'll lose, play this anti football negative crap you don't enjoy playing because then we might get a point (though 50% of the time you just lose or get embarrassed). You can't tell players that then expect them to improve over time.
Conversely if you say hey, go out there and play your best, you might lose but we'll keep playing this way till we're playing the best football you can produce and we win titles, that gives players confidence and they also aren't trying to learn two ways to play. If you want them to be attacking in 70% of the games but in 30% of the games you tell them to fight those instincts then they aren't learning to just play naturally. Someone gets a ball in midfield and his brain rather than saying turn and drive forwards is saying, should I turn and drive forwards or protect the ball... I know the boss screams at me when I lose the ball so I guess I'll protect it. Have 7-8 players on the team thinking that way and you kill the offence. This is Mourinho's teams to a T, he buys in new offensive players but after 1-2 years they play negatively, they play carefully, they protect the ball more than they should and shut down attack after attack.
Is Micky being anonymous in games because he's bad, or is it because Mourinho screams at him about every time he loses the ball so he's fighting his natural instincts and playing way way too conservatively which just isn't his game. Pep on the other hand does that other thing, gives players confidence says okay we might lose now but you'll never get better if you keep fighting your own game and playing negatively. It takes time but look at the confidence of his players now and look how well they are playing.
If Mourinho wasn't constantly changing his style against tougher opposition and instead trained his players to be the best players they can be rather than the best defence they can possibly achieve, it's very likely that they wouldn't have lost nearly as much in the past 8 games(2 of those 10 I believe are for Chelsea, same thing applied then though).
I mean fundamentally it's the same situation with Moyes, with a 1-0 lead he pushed the team deeper, played like a bottom 6 side holding on to a lead and that rubbed off on the players. That squad wasn't great but they had the winning mentality to believe they can play better, as soon as Moyes started again basically telling them he didn't trust them to go turn a 1-0 into a 3-0, the players lost confidence and began to play worse and worse.
This is why I think Mourinho teams have a short shelf life, take a good to great team, a season or two of hey, lets just not lose this one game, buying in some offensive form and doing well works but after a certain number of games the players don't buy his "it's just for this one game" mentality, they stop trusting him and lose confidence. If Pep said to his players for one game, or even a few games hey, lets defend the hell out of this as i just don't want to lose this one, they'd be fine, but you do it 8-10-15 times in a row and the players realise the manager just doesn't believe they can win those games.