Being off-guard doesn't really affect the feats.
It's not like getting sucker-punched reduces your durability when Pinnochimon's less durable hammer (which was crushed in Garudamon's talon) matched a Dramon Killer strike from WarGreymon. And MetalEtemon is literally covered in armor so his "guard" is up regardless.
The real reason neither of those feats matter here is that Paildramon has comparable, if not outright better feats against a stronger Ultimate in BlackWarGreymon. He'd clear the entire Perfect level roster of Adventure 01, with the sole exception being HolyAngemon.