See I get where you're coming from, but I think the role of DM in Pep's team is a rather sacred one.I genuinely think Ake could do the DM role no problem.
The only players to get any meaningful time there in his tenure are Touré, Fernandinho, Gundogan, and Rodri. They're all amazing at passing. Like I'd rate Fernandinho as the weakest of those 4 as far as being a passing metronome and controller, but he's still one of the best going for that role. It's an extremely high bar.
The bar was high enough so that we've almost never seen either Delph or Zinchenko there. He tried Stones once (who's smarter with the ball than Aké) and we've never seen it again.
I don't think Aké wouldn't work at DM. He's got a really versatile skillset and he could bring things to the role that none of the others have. In a post-Pep world if Aké's still here then if the new manager wants a Casameiro type then Aké could actually be superb.
Maybe I'm wrong on this one of course, but I just don't see it happening. Unless Aké is such a fantastic option as a defensive option in that role (which he may be), then it could happen. Hopefully we find out one way or another next season.