I think the only weak links in characters in terms of the story are very strong characters in terms of interesting and unusual gameplay. Since this is a game, I'm happy for three of the nineteen-thousand playable characters to exist purely for fun.
The main strengths of these weak links, other than their gameplay benefits, are that one is a feral child, one is an enigma in fancy robes, and one is a smurfing great yeti. Sure, it'd be interesting and make some sense for Bannon to return in the WoR as a beserker, but he's not a badass yeti.