Re: So Tobi is at a disadvantage that Pain/Nagato doesn't have ?
Well, Tobi's paths can use the body's real powers, and can even transform into tailed beast mode, means that the paths cannot use rinnegan powers, but are better than them due to each path is self sufficient.
IN the Pain's case, the bodies can only use Rinnegan technique, like-
1. Animal path, can only summon
2. Deva path can do Shinra tensei and Banshino tennin, and chibaku tensei.
3. .......and others, that make them a easy target to corner and kill them individually.
But thats not the case of madara, each body is a fighter.
So, Tobi's paths are more powerful.