He could certainly play how he likes to. I'm sure he'd get a lot of 4s, 5s and 6s in the league.
Are Enrique and Zidane such spectacular coaches that he can't replace/compete with them?
He finishes 2nd-4th with the 2nd-3rd best team here, no reason to think he won't finish 1st-2nd with the 1st-2nd best team there.
He's just got his feet under the table too much here. There was that podcast a few years ago that said he went to meetings about the fucking catering. He'd probably work differently under a proper president/sporting director that was pressuring him (and maybe helping him too) and he'll probably have a fair chunk of cash to sign some top players like Bellerin and Koscielny
Not saying he'd build another empire and be Barca manager for a decade but I doubt he'd be a disaster. Definitely sacked in 2 years time though.