Honestly, I'd just go with Tuel. It'd be a bad idea to get a big name FA QB, i.e. Freeman, with the intent to bench him in 4-8 weeks. The Bills do have a lot of cap space but would it be worth being on the hook for an extra 1-2m for the next couple season. Just play Tuel and see if he can ball. If he can, he'll cement himself a roster spot. If he can't the Bills can always address it in the draft or the offseason.