It's actually asinine that in order for Uther's plot to work in SL and be coherent with the rest of WoW they essentially had to create an entirely new character via the soul splitting (which invites more prickly questions then it answers).
This is what happens when you want to (or have to) shove old characters into new stories with actually thinking about it, either way you slice it, it's dumb.
If this part of uther has never interacted with us what's the point of making it uther beyond nostalgia pandering and hyping up arthas? If it is (which it isn't) how do they reconcile it with uther's other appearances.