I'm not convinced he'd actually be an upgrade over Keenum.
Do we know what we're looking for in a 2nd QB? If we're looking for a capable backup, then I hope we look to restructure Keenum. The guy is solid if unspectacular, and knows the O. If we're looking for competition for Baker, then looking at the FA scrapheap for former busts seems kinda silly. Legit competition for Mayfield would have to come in the form of a trade or possibly a draft pick... both of which would require using significant resources (ones that we need to improve other positions, which we need to do regardless of who is under center).
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