Word of Grom is that he'll escape confinement within a few updates. If he is conscious we could at least try appealing to his motivation. Why going with the targets WE suggest is better.
Trusting the insane sadomasochitic serial killer with a part of your plan is just a bad idea.
Oh...I had forgotten about someone.
Canary.
Serious question time:
Why should we care about Canary?
Yes, getting railroaded is a terrible thing.
Nonetheless, there are thousands of people in jail for shit like that.
Why is Canary so special here that we have to intervene?
Can't be her powers; we have access to better in the Social tree, and that's without bringing in artifacts.
And if we can convince Crawler to help us before he's able to escape it will be that much easier to take out the rest of the Nine. Either sic him on some of the squishier members, or he can be an expendable distraction for Siberian.
Mannequin is a stealth lord. Burnscar can teleport. Shatterbird can fly.
Siberian will simply obliterate him out of hand, and she almost always stays near Bonesaw and jack to give them the benefit of her invulnerability when necessary.
Bakuda and Hatchet Face are the only two he can reach, and Bakuda is almost certain to kill him anyway via shaping bombs.
I'm rather skeptical of Crawler's efficacy against flyers that can attack from distance.
Spit poison.
Throw projectiles.
The problem is finding them in the first place.
Crawler is about as vulnerable to Bonesaw and Bakuda's stuff as Bulldozer is - not very, but that just means that he'll be less on guard for the more exotic stuff that could actually take him out.
Bakuda yes.
Bonesaw not so sure.
As for less on guard, the wanker is crazy enough to run towards things that can possibly take him out.
Piggot used his psychosis to kill him.