Julio injured his during the combine, than reinjured it a few years later in-season. I think they replaced the original screw with a bigger one to stabilize the area, and he hasn't had a recurrence since.
Jones is still some pretty hot property, it hasn't seemed to impact his dynasty ranking.
With all due respect, foot problems is one of the only things Parker and Julio have in common. Different plane of athletic ability thus owners will accept a hell of a lot more potential risk on a guy like Julio (or DT before that with the Achilles) than Parker.
I'm aware of how good Jones is, but you could be underrating Parker. Scouts have compared his physical and athletic tools, skill set and game to A.J. Green, who was taken ahead of Jones. Also to Jeffery, one of the better young WRs in the game. They are the same height. Jones is 10 lbs. heavier. Jones ran about a 4.4. Parker ran a 4.45. Jones had a 38.5" VJ, Parker 36.5" VJ. Jones was the second WR drafted in his class, at 1.6. Parker the third WR drafted at 1.14 (though I don't think it would have been a shock if the Rams had taken him at 1.10, some of the year-to-year differences in classes could be flukey and happenstance).
Jones is one of the top WRs in dynasty rankings NOW, but at a comparable stage of development, I don't think he was the #2 or #3 WR as a rookie, like Parker is now.
I wasn't implying Parker is as valuable as Jones. Just that whatever Parker's dynasty value turns out to be, it may remain similar, if he doesn't aggravate it. Jones had his first injury in 2011, and aggravated it in 2013, so we are talking four and two years ago. Parker was injured in 2014, not sure if he aggravated it, but a second procedure was done in 2015. So we may have to wait a few years to see how similar or different their future dynasty valuation is, if it suffers from this injury at all, and if so, by how much. Since Parker hasn't played a down in the NFL yet, it is hard to say definitively from this vantage point how he will compare to Jones, as a pro?
* Not too many people predicted three rookie WRs would have 1,000+ receiving yards in 2014 (and Watkins didn't miss by much), or that OBJ might have one of the greatest rookie seasons ever at any position.
** Jones is listed with a 11'3" broad jump and 6.66 3-Cone drill time. Those are pretty insane if true (I remember Jones injured his foot at the combine after the 40 time, not sure if he did the other drills?). I see no 3-Cone time for Parker, but concede that would be tough to not only best, but even come close to. And Jones would have jumped 10" more, which is evidence of a different level of explosiveness, not just with Parker, but nearly all WRs (I think Calvin and Jamie Collins shared the old record at 11'7", before DAL DB Byron Jones broke the combine and world record with over 12'. I just think if Parker does well stats-wise in the next few years, similar to Jones, for instance, at comparable stages of development, they probably won't ding his dynasty value much relative to Jones, because his broad jump and 3-Cone drill time suffer in the comparison?