Uh yeah, that's what a #1 receiver does. Dolphins challenge, which means they lose a TO - there's no question that it was a catch, and he hit the pylon, which makes it a TD.
Challenge WHAT!!!!! That was a TD!!!! WELCOME TO NY BRAYLON....YOU CAN BE AS GAY AS YOU WANT HERE!!!!!!
Worst case, its a catch with no TD after the challenge. Definitely both feet in. Not sure if he crossed the line before his knee went down.