Not sure it would add all that much, TBH.
Not that he hasn't shown to be a capable player, he has. It's a cost/benefit situation. If it's at the right price, it could make sense.
I have no reason to believe McD will stray from the RBBC philosophy, and if that is the case, what is the addition worth? In reality, Cook is no better than what was our production last year, statistically. I do believe statistics need to be taken in context, though.
Bottom line for me, with the addition of Achane, I don't see a Cook signing as being imperative, or worth a multi-year, guaranteed $ contract.
I know you, and others, disagree, but unless our staff have the mindset of giving Cook 80% of the carries/touches, I can't see a big contract offer, and think Cook will get better offers elsewhere.
I also don't buy the premise that Cook would take a lesser contract to play for the Phins, as opposed to elsewhere.