I don't think Frazier is a 4th OF, in my opinion he will be above average, just not a superstar like some people think.
Adams + Florial is too much for Cole, in my opinion Florial will be a stud, I believe he will be a top 10 prospect in baseball by mid 2018
Adams + Andujar is fair, I see Andujar in the same ballpark of Frazier.
I don't believe Cashman really wants to trade Frazier is more like he will deal him for the right player, Florial emergence has made Frazier expendable, plus the Stanton trade, there's no room for him in the OF, Yankees have at the ML Judge, Stanton, Gardner, Hicks, Ellsbury and Frazier, 6 players who can be playing full time in several teams; if they dump Ellsbury I bet Cashman removes Frazier from the trade block.