Life without a Leader of some kind can be pretty tough for adventurers. Would it be worth posting another short recruitment post to look for someone wanting to play one?
Alternatively, we do have two defenders, I could drop my character (Bugbear) and roll up a Shaman instead (maybe an outcast or survivor of a tribe in the swamp?). Or one of us could run a second character; I could bring in Dragon Don from Bugbear's back story as a Bard, and then kill him off dramatically if/when we bring in someone to run a Leader full time.
Or maybe we just buy a lot of healing potions.