Honestly at this point I want us to extend Cook. He said $15m... unless he's a total idiot (not ruling that out) he's gotta know that all he did was set his ceiling in negotiations.
Give him a $13m AAV contact and I think he's happy.
Even if we stick with the 4 year contract theme and make it a 4 year, $52m deal, it's really a 5 year, $57m deal with his final year of his rookie contract. And I think all these contracts have an out after year 2 of the extension.
Cook is young and doesn't have much wear on his tires... I think 3 years of high level play is a good bet.