I haven't watched Pittman yet. He's on the list.
I wasn't comparing him to Burton, just identifying the role. And Burton played that hybrid role at Florida, then got used in a variety of ways with the Eagles. Claypool is definitely more athletic.
I disagree that big bodied receivers are always open. I know everyone is drawn to them, but there's skill involved in coming down with the ball, and it starts with the release at the line (not great from Claypool), it includes hand usage and body control, stacking receivers, tracking the ball, and securing it. I don't think Claypool shows those skills.
He can develop, I just don't think he's going to be ready to perform right away. He's a project, IMO. So people so eager to draft a WR out of a need to improve the 2020 roster, I don't see him scratching that itch.