If I were Atlanta, based on the scenario above, I would probably get Gobert. That way I know I'm getting consistent defense, rebounds, and effort in general. Jury's out on whether Ayton is really a legit max guy, and he's going to be looking for a max deal in a sign-and-trade or something close to it.
I think Atlanta, Charlotte, Chicago, Portland, Dallas and Toronto will all explore the market for Ayton, Turner and Gobert. Mitchell Robinson is also a sign-and-trade possibility. For any team that wants to upgrade defensively Gobert will be high on the list. I think Gobert has enough of a market that Ayton won't soften it much. But I wouldn't wait too long.
The argument for Gobert is that he singlehandedly lifts a team's defense into the top 10, which should be good for 8-10 wins.