In 2012 Matt Flynn got a 3 year/ $20.5 million dollar deal with 9 in guarantees and incentives that could have pushed it to $26 million, all based off of a handful of games. I could see Brock getting an offer of about 8 million annually, maybe 10. The Flynn thing fell flat immediately, which makes other teams nervous about paying big bucks for QBs who didn't have to do much on stacked teams.
Kubiak has also traded for somebody else's backup QB to be his long-term starter before. Hell, Kubes could just sign Chase Daniel if Oz wants too much or let Siemian do it with a vet backup on hand for downside relief. The threat of being able to put just about anyone else at the helm is real in the case. "I just need a game manager, Oz, so until you prove you're more than that that's all I'll be paying for. Manning's corpse won us a superbowl by being just slightly more effective than a cardboard cutout. Would you like to win one next time, or do you want to go play for the Rams or the Browns who haven't done anything interesting since before you hit puberty?"
I expect Brock to be back, and I don't think that precludes us from taking a QB somewhere in this draft either. Somebody like Kevin Hogan seems right up our alley if he's there late. Take him in the 5th, turn him into Brady.
And until then, give Brock his shot with with what we've got, as long as he understands he's not gonna break the bank on this shorter deal - but could on the next one if he nails his chance.