Why talk about lategame when Udyr's lategame is so bad anyways. Your only concern lategame is to be tanky enough to disrupt the enemy AD Carry, nothing else. You won't kill him anytime soon unless the game is already won and you have so much advantage. But in that case the stance won't matter.
As Udyr, you wanna win with your super strong Early and Mid, and snowball your lanes, not farm for lategame dominance. You get fast Mercs, for super ganks, into Wit's End, for super fast clearings and heavy damage in ganks and dragon fights and then spam defensive items to survive the AD when Baron and pushing starts.