On the field, I don't think it would be a terrible fit. I would still want somebody else because his offense is very limited but it would be an upgrade with what the Seahawks currently have. That, and the fact that they have a mobile quarterback shows that it could be a fit.
However, in the locker room, it seems like a disaster waiting to happen. I could never see Carroll and him getting along. Plus, he makes zero adjustments and the offense will eventually be exploited. That will lead to a bunch of 3 and outs and the best defense in football will become tired and ineffective. At that point, I could see guys like Sherman and Bennett calling him out.