>= Gus somehow knows that Mike killed those two cops as
>retribution for his son's death.

I think part of Mike's internal problem is he knows how good he is at killing people, and it's fucking with him. Gus going this far to bring him in despite all the muscle he already has only confirms it more.

I've said this a bunch of times, but Mike is the key to Gus's empire. Walt would have never got to Gus if mike wasn't sidelined. He would've sniffed out the trap. Even now Gus knows he can't best the Salamancas without him.