You never even backed up your claim. You named a couple guys who didn't sign, but were they injury/medical cases? My statement was not wrong: no one drafts players who they think will only MAYBE sign.
I listed the teams who, in addition to the Blue Jays, have failed to sign a pick from the first three rounds in the last five years. I thought that was sufficient. But here's some more detail:
Marlins - Matt Krook (injury),
Ben DeLuzio
Astros - Brady Aiken (injury)
Cardinals -
Trevor Megill
Dodgers -
Kyle Funkhouser
Orioles -
Jonathan Hughes
Twins -
Kyle Cody
Pirates -
Nick Lodolo
Rays -
Drew Rasmussen (was coming off TJ, but no injury the team wasn't aware of well before the draft)
The bolded had no medical issues, though you could switch Rasmussen over to the "injured" side if you want since he was coming off Tommy John, but that's an injury the team was fully aware of before the draft, so it's not like it just popped up in the medicals. Regardless, once or twice per year, a team fails to sign one of their early picks just because they can't come to an agreement. Considering we're talking about ~100 or so picks per year, it's not particularly common, but it happens every year.