My #1 would have to be Josh Jones. He is 6'1"-220, ran a 4.41, had 20 reps, 37.5" VJ, 11' BJ. More straightline, but if he gets in man coverage and can keep a body on you, he can run with most big TEs. He will thump. Good range deep, so he is solid in zones. Just a big safety with a solid all around game.
For the #2, probably Marcus Maye. His issue is range and angles on the back end. He is better in the box, bumping in man. He is 6'-207. He ran a 4.47, better change of direction with a shuttle of 4.18. He will smack you too. Weaker in zone, especially the deeper he gets and the more ground he has to cover, but as you move him down, he gets stronger.
The #3 is Obi Melinfonwu. He is excellent in man. Nice hitter. Not as instinctual in zone, has to see it to react. The more space you give him, the slower he plays. Doesn't have great COD, like Jones, needs to bump and rub off speed, but should be able to handle most TEs. Good athlete but doesn't play like a 4-year starter with his instincts.
At #4, I really like Rayshawn Jenkins. He is another big safety, at 6'2"-214 pounds. He ran a 4.5 with a 4.20 shuttle, 2nd best on this list. Good in man, good in zone. He will hit you. Flies around the ball sometime and can miss because he gets a little out of control, but I'd rather have a guy I need to reign in than one I have to get going. Really good athlete, looks bigger than he is listed.
My #5 kind of comes out of left field, but for some reason, I really like Nate Gerry of Nebraska. He is 6'2"-218 pounds. He ran a 4.58 forty with a 4.37 forty. Another guy that will smack your ***. Not as athletic as the top 4, but he plays hard with a ton of grit. Just keeps working. Great instincts. Great ball skills. He might be a free agent, but I think he is smart and a hard worker and can develop.
Now, those are $backers, not guys I stack in the slot over little WRs. I have a whole different group for them. This bigger guys won't run with the Edelmans of the NFL.