I started to make this point in my first post then deleted it to keep it simpler and to keep my main point from getting lost (that Mahomes and Wentz both found quick success in this offense as 2nd year NFL players). But to this point above, how about drafting a QB into a WCO? You literally can't do it if you actually believe it would take this long to "begin to have success" as my friend G08 put it. It just doesn't work in today's NFL/salary cap system. Assuming he's a 1st rd pick, you have to decide after his 3rd year if you want to extend his 5th year option. If he hasn't "begun to have success" yet, how do you make that decision, knowing if you do it and are wrong you've got a 20M+ turd on your roster and you are totally effed.Nobody would get hired in the NFL in the 2010's if they went into job interviews/pressers saying:
"Hey, my offense is going to look like utter shit most of the time and hold the entire team back until my QB figures it all out."
"How long do you think?"
...
"Hmm. 3 to 5 years."
You're point is spot on. That quote wasn't meant that a QB won't see success early in the offense, just that it will take years to completely master (I'd bet that includes getting all the right moving pieces around him as well). And this is proven out by the examples we both gave, you're list being far more exhaustive. I kept mine short and sweet because I know what happens next - someone will cherry pick one player on your list that they can pick at for some reason, and dismiss the entire point of the post.
EVEN STILL...I STILL think Mitch can POSSIBLY turn it around. I haven't completely given up on him, 20% chance feels generous and is largely based on who he is as a person - he has the personality traits of a winner IMO. So good luck bucking the trend kid, we're all better off if you pull it off. But I'm VERY VERY relieved that we hedged our bet with Foles. Now all I want is a true, fair QB competition - I still think Trubisky gets the nod Week 1 because he practices well and the want him to win it. But then I think he puckers up at the first sign of trouble, and his mental game lets him down.