"I just laughed today. He put on a show," Mayock said. "That's the beauty of having a full workout at the combine. You don't ever have to do those drills again. He came out, he caught the ball. He's a top five pick in any draft. That doesn't mean he's going to go in the top five, because part of that depends on the quarterbacks. But, to me, he's a top five talent in any draft."
Tajh Boyd was another attraction.
"I thought he had a great day," Mayock said. "If there is one thing that Tajh Boyd has is arm talent. I think he showed it off today, that arm strength, touch, accuracy, everything you'd want to see in a quarterback."
Boyd had just one incompletion while throwing at Pro Day.
"I think I know what he is, and he's got a lot of talent," Boyd said. "He's very raw, as far as some of the things he's going to have to develop at the next level, in the NFL. I love his arm talent. I love his athleticism. I love that he's 32-8 as a starter. I think he's a winner. I think there's stuff there to develop.
"I just think the consistency and the accuracy in the games has to get better. I think his understanding of pocket awareness has to get better. You can only do that through a lot of repetition."
Mayock also weighed in on Martavis Bryant and Bashaud Breeland.
"I would have loved to see both of the juniors come back for next year, both [Bryant] and Breeland. I think, had they come back, they could have been considered significantly higher," Mayock said.
But wide receivers with Bryant's measurable are in high demand these days.
"He's 6-4. He's 210 [pounds]. He catches the football. He's got great speed," Mayock said. "In today's NFL, with the back shoulder fade, he's kind of an interesting guy, so I'd be surprised if he got out of the third-round."
Mayock has been impressed by a pair of Pro Day participants that lack some of the measurables: offensive lineman Tyler Shatley and linebacker Spencer Shuey.
"I always root for a guy like Shatley or a guy like Shuey," Mayock said. "They both were very productive college players. They might not have the measurable other guys have, but I think both of them have a passion for the game. It shows on tape and it showed today."