Armor Dilemma

I got a -atk+ res M Grima. I was thinking to fodder him but hes still just so badd ass, however Zelgius and my potential Sheena merge are eyeing him hungrily. I already have nice Hector +atk -spd, Amelia+1, Lissa, Hardin, and (Effie on another team w BK).
So Who is the best Vengeful Fighter use?
Also have a second hardin, was thinking to save BF if i ever get a ranged armor...

I made the mistake of merging Amelia back when she was top tank as it gave her spd+1. Now i am just dying for more armor march as i dont particularly want to use her now. It would just feel so bad to sack a merged rare unit.