It will be interesting to see what the Patriots do with Jimmy G. He'll be a free agent next summer and will most likely be on his way out of New England.
Due to this, I see him as a prime trade candidate, similar to Sam Bradford last season. If any QB on a contender were to go down, the Patriots would probably be able to get a 1st rounder and a 3rd rounder in return for Garappolo.
He's too good to be a backup on the Patriots yet relatively unproven and older than the QB prospects in next year's draft (which is said to be loaded). Interesting to see how the QBs will shake out.