At 5'11" and 197 pounds, Kirk is built more like a running back than a receiver. He has a thick frame, and his strength is deceptive.
The 5-star Arizona native is an explosive athlete who has a ton of suddenness. Kirk can work on the perimeter or in the slot, as he shoots off the line quickly to launch into his routes. He can wiggle around jams at the line, and he skates out of his cuts to separate from defenders.
He had solid hands and ball skills, but his best attribute is his run-after-catch ability. Kirk is awfully elusive and quick with the ball in his hands, as he routinely shows off an ability to cut at full speed and dodge defenders.
He has the vision of a running back with the ball, which is why it won't be surprising to see him in the offensive backfield in college. Kirk can slash through creases to hustle to the second level, and he has the tight-space quickness to elude defenders in alleys.
Finally, Kirk is a fantastic return man. He has the quickness and confidence to effectively return punts, while he displays the strength and long speed to bring kickoffs back.
Kirk is an absolute clone of Seattle Seahawks receiver Percy Harvin.