It looked more like Little Ala Mhigo to me, and with that Illberd seems the most likely person to be taking that mask. Also have a small theory that Wilred actually ISN'T dead and that he is taking the mask so he can continue doing...whatever he is doing, or starting to do, without being discovered. In this case benovolent but maybe not the best idea.

Though Illberd still seems much more likely and the Wilred one is just me theorizing things unlikely to happen.