hm ok, this is reasonable. Maybe I overestimated the use of their sensing abilityNah, His sensing feat isn't really that impressive, Like i said even minato can replicate it.
People Like Naruto/Karin/Muu/Nagato can use their sensing abilities in battle and on the move, While Tobirama has to stop and put his finger on the ground. Also it seems that Tobirama's ability can only sense Location and enemy numbers and not go into detail of chakra strength/chakra size or being able to sense Build up of chakra or incoming attacks (like nagato did with itachi's amaterasu)