"I'll, er, wield it if you, ah, prefer, but, ah, I think you should, er, give it a try. Nezrak is, ah, probably better off with his, er, magic."
OOC:
The size penalty is only -2. I think you were using -4 for your calculation. Nars uses weapon finesse so would take the same -2 penalty for not using a light weapon. Gorefoot's attack bonus is higher than Nars so he will hit more often and he also has cleave.
Either Nars or Gorefoot is probably a better choice than Nezrak since Nezrak likely won't be doing much attacking.