To be fair, I think Silva is going to be the Pivot, but Isco can play it too. And might be defensively superior to Silva.
Also 1) Stones should be better 2) and Laporte would be the partner either based on my incoming.
Also I wouldn't lie to you, I'm not a big proponent of plugging every weakness. If we are weak in the air at DM but better at controlling play and creating chances because of it, I'm okay with that. What matters is what adds up to the best team.
I'd rather we strengthen what we are good at and become great at it. So make our wing play dynamic and scary fast - Sane, Sterling, Mbappe. Play smoother out of the back and our of pressure: Bravo/Ederson, Laporte/Stones/ Ota, Bernat/Grimaldo, Semedo/Perreira. Control and Creativity in the middle ( Silva, Debryune, Gundogan, Isco, Dihno) And technique and deadlines up top Aguero, Jesus
That in my mind gives us our best team.