He won't get drafted if he does that. And if no one drafts him this year, he becomes a draft fa. I don't think he could relist for next years draft
http://mmqb.si.com/2015/05/02/lael-collins-2015-nfl-draft/
Then came this bombshell from the Collins camp: If drafted beyond round 3 (or not drafted at all), Collins would decline to sign, and would sit out the year and enter the 2016 draft. Ostensibly, the motivation would be to recoup the guaranteed cash he has lost by falling out of the first round.
For the first scenario, there is precedent. Bo Jackson, drafted in 1986 by Tampa Bay, played a season of pro baseball rather than join the Bucs, and because he refused to sign a contract the team lost his rights before the next draft. The Raiders chose Jackson in the seventh round of the ’87 draft. Today the cutoff is Week 10, and you get thrown back into the next year’s draft pool.
You can do that.
But what if you’re
not drafted, and you want to sit out a season and gain entry to the next draft? There’s no precedent, and zero language in the 2011 collective bargaining agreement providing for such a scenario. Media reports subsequent to Collins’ declaration have yet to touch on this, instead treating his assumed admission to the 2016 draft as a ’15 UDFA as a given.
“It certainly is not automatic,” said one agent well-versed in the CBA. “There is obviously some language in the CBA that can lead to a rendering of an interpretation by the league on the issue. How valid an interpretation that is would have to be examined, and if a player thought it was not a correct interpretation he could bring a System Arbitration challenging it.”
NFL spokesman Greg Aiello says the league’s stance is clear: “If he’s not drafted today? He would be the same as any other player in this draft. He becomes a free agent like any other undrafted player. You only go through one draft. If he’s drafted and sits out the year, he would go back into the 2016 draft.”