In order:
Alonso (unrealistic)
Nagelsmann (slightly unrealistic)
Emery (realistic if thrown a bag of money too)
Poch
Tuchel (if he doesn’t have a veto/great involvement on transfers)
I think I’ll even take Poch over Tuchel just because he develops the type of players we have more than Tuchel. Let’s be real: we cant possibly go for the title this year or next year, it first comes when we’ve developed the talent we have. Developing Garnacho, Amad and Zirkzee to go to next level probably takes 2 years. I’d trust the other 3 managers way more than Tuchel in doing so. Getting in Poch for 1-2 years is cool with me, as we wont win anything of note anyways imo. After 1-2 years, better manager options emerge again, and then you move on from Poch. I’d prefer Emery though, but from the easily attainable managers then Poch over Tuchel.