This is like blaming yourself for not winning the lottery... Nobody knew Mahomes was going to be this good. There were recent QB's with his level of production in college that didn't pan out, Johnny Manziel and Geno Smith come to mind.
You can't blame an organization for not winning the lottery on a pick that was surrounded in uncertainty, but that isn't going to stop Sully. The guy is a creature who feeds off of negative emotions, looks for excuses to revel in them. I kind of feel sorry for the guy, I couldn't imagine having a career were the highlight of my craft was rooted in being a mean spirited prick.