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This may be the most persuasive argument against dragging Brett Favre out of retirement.
There are better options available, both via free agency and via trade. Former Jaguar's starting QB David Garrard is still looking for work after being cut by Jacksonville a few days before their season opener. Despite ESPN reports to the contrary, I wouldn't put it past Garrard to accept an offer in Indy.
Another options is former Bengal QB Carson Palmer, who has "retired" after the team refused to trade him. Should the Colts offer up a pick (or two), they might be able to pry Palmer away from the Bengals. Unlikely? Yes. Impossible? No.
Finally, there is this absolutely, positively crazy idea: trade for Mike Kafka of the Philadelphia Eagles. In limited action Sunday night, Kafka looked like a legitimate NFL QB against a strong Falcons' defense. He finished the game 7-of-9 for 72 yards with zero TDs and zero INTs. Both of the incompletions were not the 24-year-old QB's fault (one drop, one hail mary pass).
The Eagles would certainly want some significant compensation for Kafka (second- or third-round pick), but he'd be an ideal protege for Peyton Manning when he returns.