Since they are so fun, let's deal with a hypothetical scenario...
Our QB situation at the moment stands as:
1. Vick 2. Kafka 3. Edwards
I'd have to believe we bring in competition for Edwards, and I've supported drafting Tannehill provided he falls to us. The team has left the impression that Kafka will get his shot as the #2. But let's pretend for a second that we are in November, and Vick gets injured (again) and we are in 1st in the NFC East at 8-3 with 5 games remaining. Vick will be out 4-6 weeks with his injury. We would certainly have a few division contests remaining, and we would need to maybe 3-2 at worst to cement our playoff berth.
Here comes my question: Would we rely upon Kafka to deliver us into the playoffs? Or would we bring a veteran QB in? This is a similar question to what the Bears dealt with via a Jay Cutler injury this past season, and they relied upon their backup QB, Caleb Hanie, whose track record is not very distinct from Kafka's. The Bears passed on several veteran QBs to take the role immediately before finally bringing somebody in, but Hanie was so ineffective that they were almost immediately out of contention, and made it a point of emphasis to address this situation this off-season snatched up Jason Campbell.
One man rumored to have been a fit in Chicago last season was none other than Donovan McNabb. And I ask, if we were in this very scenario would you bring him in if there was mutual interest? It doesn't appear he'll latch on until an injury occurs, and this would fit the bill. He knows the system, the coaching staff, and many of the players. Certainly he comes with certain drawbacks, and it would be iffy if he would want to come back, but say he did want the opportunity. What do you say? I'd say, why not.
So I pose the same question to you: