They always cut the timeline short, since in 2012, three guys selected in the mid-rounds had good pro-careers.
Of those 73, how many ever even saw the field other than in garbage time or a couple of games here and there when the starter was down? The number looks a lot less impressive once you get to those realities, particularly when you consider that a guy like, say, Stidham, who get minimal chances, won't really be looked at by other teams as he ends his rookie deal.
Add in the reality that only a handful of teams each year win a playoff game, and many of the QBs on some of those teams have been the QB for a long time (Brady's been stealing 2-3, even 4 wins a year for 20 years), and the statistic becomes even less impressive.
If Mond or Mills or Trask run as fast or can throw nearly as well as some of the "super 5," and better than others of that group, then the physical tools are obviously there and it comes down to evaluations - which are always tricky, particularly in college, where one guy might be throwing to Waddle and Smith, or Chase, and might have a dominant cast of characters, like OL, around him.
This year looks a lot like 2012 to me. Best QB year in many:
Round 1:
Luck 1
Griffen 2
Tannehill 8
Wheeden 22
Round 2:
Osweiler 57
Round 3:
Wilson 75
Foles 88
Round 4:
Kirk Cousins 102
You see a big difference in the careers between the top 3 and the last 3 on that list? (And it's only close because Tannehill was revived by a team that had a scheme perfect for his skill set.
So why won't Mond, Mills, Trask, maybe Newman work out?