Like anything in football, it's nearly impossible to identify a need without acknowledging a supporting cast. First, I like Gaskins, but he's too small for the tough yards. Brown? Too slow to get the big yards. Thus, I agree a better RB would help. And I'll be disappointed if anyone throws out the 'elite QBs don't need a running game' myth.
Given that, no one knows yet if TT is the answer. I'm optimistic, but not certain. Fans will know a lot more by game 17. I mentioned elsewhere even Henry needs some small holes for big gains. That's uncommon for the Fins. A good pass game helps the run game and visa versa. No honest person will claim the KC run game would be as good with JB and Mia's OL.
Two paragraphs to say, yes, Mia needs a better RB, but the RB, by himself, wouldn't make the O top 10.