Muu doesn't have enough feats to go up against Tobirama.
So luckily, your lord can win this.
If Tobirama can manage to mark Muu before he enters his subtle state, he wins.
Even if invisible, Tobirama can sense him since Tobirama is not only a regular sensor, but a physical one as well. From sensing their chakra levels he could judge that they were master bounty hunter level, and by physically sensing Muu likeYou must be registered for see linkshe would find him and use a Bunshin to Suidanha him. Tobirama physically sensed the 20 ninja by the way.
That isn't physical sensing as he clearly isn't touching the people he's sensing.
Gaara wasn't touching the clam though. He used the sand as a medium, as Tobirama and Minato use the ground as a medium.
Uh no. That isn't how it works.
-Gaara's sand was making direct contact with the clam allowing Gaara to sense it.
-Minato and Tobirama don't make direct contact with their target with anything used for their sensing. You can't say the ground is their medium cause Shinobi who weren't even touching the ground have been sensed via that method. That right there shows that the ground is not their medium and that their finger sensing pretty much comes from the chakra sensing technique.
Not to mention Mu can fly, so even if Finger Sensing worked the same as Sand Sensing, it wouldn't matter.
Muu can fly while he is invisible? I thought to stay invisible he had to not use any chakra?