I honestly think Maia found his way at 170. I think he beat Shields in that really really close fight (like in no losers fight). That would technically leave him with one loss in the division, in a fight of the night against rory mcdonald in which he definitely won a round and a close to winning another.
Demian Maia should easily be swiming with the top sharks at 170 given his run but no one is really considering it... why, again? Dude is underrated for no reason really.