Yes. Darnold needs as many savvy pass catchers as he can get. You cant just measure the value of a Cooper Kupp on catches alone. The dude is another qb on the field and can help Sam immeasurably.
He is also the type of proven vet that can help mentor a guy like JSN. JSN just lost 2 guys (more Tyler than DK) who were guide posts for him and the way each left, though for different reasons, cant be having a positive effect on that position groups outlook. Say what you want about Geno, but i am sure that he and the wr group viewed the last few years the same way - not great - overperforming individually in an overall poorly run and staffed unit. You may disagree with that assessment, but i doubt the wr and te room is looking at what's going on right now and thinking 'yeah, we are good to go'. Getting Kupp would be a smart move to help steady the ship, help Sam's development, and mentor a very young WR group. And that is to say nothing for whatever wrinkles his knowledge of McVay's scheme can add to Kubiak's attack.