While I understand your point, the irony of this situation is that clearly you can have too many quality QBs on your roster. Otherwise, he wouldn't be transferring. And keep in mind, it was a decision he made on September 29, less than a month after he started week 1. It's not as if he gave it a season and decided in Spring. He literally bolted the moment he lost the job.
To play out that scenario, let's say we bring him in, and a kid like Allen starts to reconsider joining a team with Del Rio, possibly 2 RSFr, and basically another RSFr in Barnett? Tough to blame him for that, imo. Four Qb's with little or no separation is unrealistic. Considering both he and BB would be available at the same time, I'd rather have the kid that's stood by us and is all Gator than a kid that we'd basically be getting because he didn't get his way somewhere else. All we have to go off is history, and his history would indicate he may very well do the same thing again. No thanks, imo.