There are quite a few differences between Potter and RDZ though. First of all, as you say De Zerbi is more of a purist, I also feel that he's less motivated by money. That's not a criticism of Potter; he has a young family while RDZ's kids are older, I'd also assume that De Zerbi has a few more...
There is zero chance of RDZ going to Chelsea: he's not stupid. I think it's unlikely that he'd go to Utd too. An unbalanced squad with unreliable owners and an entitled fan base. As the squabble with Sancho shows, there are issues behind the scenes there and it's a place most ambitious managers...