personally, I don't believe choosing 1 small fraction of a players career (getting drafted) to define success is honest business. By that single, "getting drafted" metric, i'd argue that North Dakota State is a better QB school than OSU. Carson Wentz and Trey Lance, but no one talks about them as a QB school. We don't say "John Elway is a successful QB because he was drafted #1". Same with Jamarcus Russell, Heath Shuler, Ryan Leaf.... the list goes on. Conversely, Washington State isn't a top QB school, even at the time, because of Ryan Leaf.
Which leads to a second argument that taking such a small sample size is so incredibly disingenuous. We don't take PSU as RBU because of Barkley and Sanders. Clemson isn't QB-U because of Watson and Lawrence. I just believe the entire argument that "because of the last 4-5 years...." is honest