Temporarily doing nothing major is okay by me! I think that the only business a Visser One would have, would be keeping an eye on the efforts... possibly ascertaining whether or not Visser Three is doing anything to climb the ranks so he can knock him down a few pegs if he's threatening his position. >.> But Visser Two would be a bigger focus in that respect since he's even higher on the chain, and since Visser One is the mighty andalite controller here, he's probably running a fairly tight ship and wouldn't have to resort to such underhanded tactics. Conquering Earth is important too, after all. But he's probably less of a showboat and won't be morphing the giant man-eaters unless he really needs to.
OH OH xD
Since he has hundreds of human morphs - Am I allowed to keep secret who is Visser One, and who is just a random controller? Like, I'd tell YOU so there's no tomfoolery, but the other RPers wouldn't have to know.