Of the 2018 QB class, how Josh Rosen pans out is what I am most interested in finding out. Compared to consensus, I am down on him more than any other top prospect. This is because I come from a statistical background, and Rosen does not shine in any of the metrics I find valuable. He never broke out, which I define as having a season above the age-TANY/A* trendline for first round QBs (shown below). From an efficiency standpoint, Rosen looked like a Day 2 prospect throughout his college career. His mobility comes out negative, meaning his rushing production was lower than what he lost on sacks. Scouts have glowing reports on Rosen's mechanics, which is why he will be taken early in the first round. It's also why Rosen still leads my second tier of 2018 QBs, despite his lack of statistical prowess. Along with Sam Darnold and Lamar Jackson, Rosen is one of the younger QBs to come into the draft. Because of everything above, Rosen will rank as my least rookie-ready prospect of any QB taken in the first round in the last 15 years. This may come off as a bit of a shock, considering the reports on his mechanics. But youth, lack of mobility, and mediocre overall efficiency all correlate with poor performance as a rookie. He will almost certainly get opportunity as a rookie, and I still have high hopes for his future. However, if he does succeed, a Jared Goff-like trajectory (poor rookie season followed by a breakout) is more likely than Rosen shining out of the gate.