The speculation really needs to stop here. Check it:
(1) Teams have already known about this for a couple of months. It says directly in that article that he disclosed the re-injury, or whatever it is, at the combine. If teams were concerned we would have been hearing plenty about it -- not just 2 days before the draft.
(2) Its not a huge concern as he did all of the drills at the Combine. If you think you can go through the combine with a major injury to your collarbone, you're kidding yourself. Collarbone injuries slow sedentary people down; you think he could absolutely tear up the combine? The point here is that he was almost fully recovered at this time.
(3) So, you think that he could do the combine, but feel hes going to be an injury concern. according to many websites (ie,
http://www.shouldersolutions.com/ac_4.php) it can take an adult up to 4 months for it to heal. If he reinjured it completely at the fiesta bowl , and needed a full 4 months to recover (highly unlikely) , he would be fine for April 1st. He has until July to make camp. I think he'll be fine.
Also, Collarbone injuries aren't ones that will typically be re-injured. How many guys do you hear in the NFL that broke their collarbone? He simply won't have enough stress on it to hurt it again, even if it was a chronic problem (which it certainly is not).
His upright style won't add to this injury problem either; it *could*, if anything, add to injuries such as bruised ribs, knee ligament problems, etc.