After all, Drumm has had the raw power and experience to take over the mantle before this...
He has? When? I thought he was supposed to be an extremely minor practicioner of mysticism, probably not as capable as the goons Strange's usual enemies employ. I'll grant that he's a noble heroic figure with a long history (when he hasn't been treated as a joke), but I'd think that every other candidate we've been shown so far is his superior in terms of expertise and raw power.