After Winston gets drafted and runs his course as a green bean Manziel will be brought in as a FA .... and on and on it will go for the green bean circus.
This is why BB isn't enamored of the overly-mobile QB, especially the smaller kind. He's OK with them taking off on occasion, but he doesn't want one that's going to run 10–15 or more snaps a game.
The QBs who are gunslingers but can scramble if/when they need to such as Luck, Rodgers, Romo, Roethlisberger (to a lesser degree) have all had a good amount of success. Their primary option is to throw the ball, and they only run, scramble, or move around in the pocket when necessary.
The QBs who do the opposite such as Cam Newton, RGIII, Geno Smith, Teddy Bridgewater, even that bum JaMarcus Russel etc haven't had much success at all aside from maybe one gimmick season.
I suppose that Russell Wilson is the one exception to this rule right now. Time will tell as to how Johnny Manziel does.
EDIT: I just realized that all of the QBs in my first grouping were white, while all of the QBs in my second grouping were black. This was merely a coincidence, as my point had nothing to do with race whatsoever.
I seriously doubt that there was ever any risk of the Patriots drafting Manzeil. Somehow, I just don't see Belichick giving a high grade to an alcoholic QB.
Brandon LaFell now and then look like 2 different players. Tom and Rodgers are probably the 2 only quarterbacks that really elevate the receiving core around them. That isn't even a great core of receiving options. If you only have 2 viable receiving options(I'm being very generous towards the Carolina LaFell) and your name isn't Tom Brady or Aaron Rodgers you aren't going to get much done offensively.
If you look at LaFell's numbers right now vs. last year, they are almost identical in number of targets, catches, yardage, and even TDs.
The difference of course, is that he has Tom Brady throwing to him, so he's reached his production from 2013 in only 75 percent of the time with 4 games to go still. That seems pretty reasonable to me when you have an actual QB.
2013 (Carolina) 49 catches on 85 targets for 12.8 YPC and 5 TDs
2014 (N.England) 53 catches on 86 targets for 13.4 YPC and 7 TDs
LaFell, while underused and still coming into his own at CAR was a high round draft pick with size who showed improvement in every year since coming into the NFL. My guess is that he'll continue to see more targets and production in future years.