Quote Originally Posted by Ardox View Post
A McGuffin for story telling. Having asked us to remember them in his huge form would not have the same impact
It's not out-of-nowhere. Emet-Selch mentions (I think during the scene where he's thanking Varis for all the clones) that he CAN fashion a body for himself at will, but the clones are much more convenient.

As you say, it's likely that he assumes human form at the end in order to evoke a bit of empathy (both in the WoL and in the players of the game), but it's a power he's known to possess.