Do you have a source for that or is it mere speculation masquerading itself as fact? I always saw him as an Imperial in Nord clothing as I would expect Nords to be a bit more burly and have a stronger voice. But that being said its not like it really matters as I am sure everyone here will be making their own character.
Burlier? It's difficult to get much burlier than that guy.
Also, we've hardly heard his voice other than that one dragon-shout, which sounded pretty "strong" according to me.
Whats funny, is that the guy you hear doing the shout is the guy that wrote and created the dragon language. They are probably going to hire someone to do the voice though.
edit:http://www.gametrailers.com/video/todd-howard-gt-tv-extended/713232?type=flv @ 8:18