Ok, that sounds like a completely reasonable idea. :) But, just so I'm clear; I can have Lyndus be an Arcane Warrior, as long as his magic is mainly, if not entirely, focused on defence? If he has to give up his magical abilities to keep his tanking higher than normal warriors that's perfectly fine with me. Lyndus was originally to be based around pure physical prowess, but Skyrim drifted my decision and made me want to use magic at the same time haha. 

I've fixed him up, making him a Warrior/Tank, no magic.