Summer Xander: keep or fodder

Summer Xander is one of the units I wanted to pull(I like his art a lot)on this banner and fortunately I did.

However, although he’s +def(yay), he’s also -atk. I also want to build Marisa(already summoner supported her and going to +1 merge)and with her high HP Fire Boost seems like a great option.

I really want to use him, and I’m not sure if I will pull another one, since I also want Summer Frederick. I don’t think the -atk hurts that much since he has high HP+Fire Boost and also Infantry Pulse which is really valuable. I also like to build different teams and I was running out of green units. Should I just use QP+Ignis(I don’t have Slaying Axe fodder atm and Lilith Floatie seems so cool) instead of Bonfire to make up for the attack bane?

Thanks in advance and hope you pull the units you want!