The overall positive effect Adams would have on this offense is incalculable.
Having a true number one like Devante would actually, in my mind, make this a quality receiving corps. The amount of attention he would command from opposing defenses would help open things up so much for Kincaid, Knox, and Shakir underneath.
And as you say, it would lessen the pressure on Coleman, put him into more advantageous positions, and give him the perfect vet to learn from.
And if things click and Adams likes it here, I could see them working out an extension and Adams ending his career as a Bill. I think he has 1-3 years left in the tank.