I feel like you could easily argue both sides of it being suited to 343 … some elements are, some aren’t
I’d be really surprised if that was the reason
Then again if nagglemsan, de Zerbi and Amorim all aren’t candidates I’ll be honest I don’t understand the criteria
I think it's less suiting it and how married he was to it.
If we had questions over Amorim because of other factors (like if he can make the jump, some of his tactics perhaps, his buyout clause, idk) and on top of it he is like "We have to play this way and I need all these players to do it" we may turn away. We may never know. That was certainly a difference between Klopp and Ancelotti, and we know in a better position to say don't rock the boat too much it isn't needed
De Zerbi seems to be he wouldn't suit the structure (i.e - he would cause too many fights with the nerds) and Amorim we don't know just that he didn't fit. Nagelsmann seemed to never really take off at all, maybe he didn't want it, maybe we didn't want him. Again we may never know.
I think it's obviously going to be a number of reasons what decision we make, but I wouldn't be shocked if one of them is compatibility to our squad (not even tactics, compatibility to how the squad is set).
We will probably know further down the line what's been up. Right now all we can do is pull stuff out our ass based on guesses or half information and innuendo