Actually nimble works well for all battle brothers, and as the game progress’s and u have more gold u should be replacing alot of your melee fighters with hedge knights, sword masters, marauders, militia, and even nobles(nobles i prefer not to use, have negative rdef)
For the person who mentioned what should u stat i go Mdef/fatigue every level, Matk to 70, then hp. For my 2 capitains its Resolve/Mdef/Fatigue