They can destroy the meteor with a quake or at least a double quake. These guys can cause tsunamis or overturn whole islands with a single quake and they can use them without limit. Also I know full well they can't hit Tobi if he's entirely in another dimension, but he would need to constantly leave entirely otherwise the parts left behind will be fully affected. That would constantly leave him on the defensive and Madara alone. Plus if he blindly warped back, he could easily warp back into a quake.Blackbeard's sucking does take time, but he can still affect them instantly. Kurozu for instance will just bring them to his grasp. Susanoo or no, Madara is still affected by gravity.