Brooks is an ok player. Poor first grader / borderline reserve grader as an organising half, can play well at 5/8th. He's not going to be some revelation at Manly, not a chance.
He'll do better than here I'm sure, but he's not going to suddenly become some great ball player or put on a bunch of tries with his short kicking game. His running game can be quite good, but he does still make some very questionable decisions when it comes to his choice of time to take on the line and the way he does it. Obviously having a 7 in DCE will help a lot in that regard, but the point is that a lot of his flaws are inherent to him and not products of the system he's in or the team around him.
Giving him 4 years as a guy who greatly relies on his speed, and that has already seen some loss of pace already, is definitely a risk. Brooks is much more likely to regress during this deal than improve as a player throughout it. On top of that, does this 4 year deal match-up with DCE's timeline? DCE is 34 now ... will he still be playing at a high level at 38? Do Manly have a contingency plan if DCE calls it a day in 2 years? What if Brooks needs to play 7 in 2025 or 2026 ... big problems in st