I have him at 13.5 million a year. Would put him just about top five at his position. Given his play this year he is probably in the 5-6 range of players at his position. Take the Shaq Thompson salary of 13,540,000 annually adjust for the salary cap going up to 225,000,000 that puts you at 14,632,564, adjust again for playing time missed over a sample size of three years (86% games played) leaves you at 12,584,000, give him the extra million for percentage of snaps and I think 13.5 million is a good number for the guy.
Tremaine is probably young enough to get two mega contracts in his time in the NFL barring injury. Hate that the Jets, Colts, and 49ers paid their ILBs 19 million plus, just absolutely stupid money.