My real genuine thoughts on the issue, no sarcasm this time...
Gattis IMO is NOT under any circumstances a fit with Miami & I don't think his Offense is anything special at all.
It works in the B1G because regionally they produce big roadgrading OL's that make the job that much easier for the RB's, but it's not a QB friendly Offense & is primarily predicated on dominating the LOS, which seems like exactly what you want, but the big issue I have with those style of Offenses is they have no counterpunch.
But beyond that, his actual play calling abilities are very suspect IMO in terms of his feel for the game & knowing when to & not to call certain plays. I also do not see any strategy in the sequencing, he's not setting the Defense up for anything, it's just a very surface level scheme that has to have certain types of players in order for it to work. It's not a one size fits all plug & play style that's transitional & works with interchangeable pieces, it's a formulated template that you have to recruit specifically for or else it will not work.
I personally prefer Offenses that are more malleable, hence why you see certain Offensive minded coaches have success at multiple stops with multiple style QB's/WR's etc.. I think it makes the most logical sense to have a system in place that doesn't cut in half the number of recruits you can target, meaning, having an Offense that is designed around spacing & speed without specific parameters that each player has to fit into mathematically increases the number of recruits you go after & attract, which widens the scope of the caliber of player you can bring in.
This is a Northern/Midwestern ball Offense & unfortunately we're a Southeastern team that has readily available access to smaller speedy types who are better in a more wide open setting.
The best way I can describe it is, imagine if Air Force or Army tried to run a conventional Offense & how much of a disaster that would be for them...
As to whether or not Gattis should be brought back, to me it's quite clearly absolutely not. But if you're Mario & you really believe you can win with that style of play & it's simply a matter of recruiting your players, then I can see why he might want to bring him back.
I think it will fail miserably & we'll still be a below .500 team or slightly above .500 in the 7-5 range at best...
But I also am always in favor of seeing Chaos happen, so why the **** not? Lol (That was a joke relax)