Sendai Cannon

I do like baiting with dual ward armor on him (plus I tend to use the other 2 to bait other units too), so thanks for letting me know I don't need to sacrifice one of my 2 Ikes. Thanks to the Hardin (and some fun positioning) I managed to do the Infernal Ryoma battle with a full Armor emblem team (M!Grima, WE!Robin, Zelgius, Hardin)! Now for the next question, I'm currently running M!Grima (the one with the bad -atk +spd) as a mage/range killer because he hits the lower of their defenses and because someone on my armor emblem team needs to do it right? So I have him with the distant defense seal, and I'm wondering whether I should put Distant defense, warding breath, hold out and try to get mirror stance on him, or try something completely different. Thoughts?

I'm going to try to get WE!Robin! Well, this works too I guess... (and I don't think I had any pity rate on this summon too)

So with my luck as a F2P player, saving orbs, and with pulling only blue, I've some how ended up with 5 copies of Hardin (and here I just wanted more Christmas Robins because he was one of my 1st 5* when I started playing). So here's the question, I know bold fighter is good fodder, but should I make a +4 Hardin? And if so, which one should I use, and what skills should I put on him? The best 2 I have are +atk -hp and +atk -spd The skills I have that I'm considering putting on him are Warding Breath (no Steady Breath, I've never gotten a B!ike) and maybe Aether because of the Breath and bold fighter combo. If it helps to know, I usually run an mostly armor emblem team with +1 Zelgius (summoner supported +atk -hp), winter Robin (-spd +hp, I mostly just use him for armor march), M!Grima (+spd -atk D:) and Genny with pain and dual Savage Blows Any tips are appreciated, thanks!