Tobirama's FTG isn't as efficient as Minato's but it would still be a heck of a boon against the Mizukage assuming of course he could get past the clam summoning 😄. Seriously though either that thing is hard as phuck to find or the mooks were just hell of incompetent in that fight.
But all of that aside I'm actually on the Mizukage's side unless a better case for Tobirama comes up.