He was a more accurate passer in college than Cook. And did that while apparently having all these mechanical flaws.
Cook, on the otherhand, is supposed the more mechanically sound QB and yet could never get above 60% passing in college, which has been shown in other threads, is a huge negative in terms of moving onto the NFL. Guys don't go from sub 60% in college to accurate passers in the NFL.
So yeah, with all his flaws and rawness and mechanical work needed, Lynch is more of a sure thing than Cook. Frankly, I don't think it's even close. Reality is if you look at trends, both will likely bust out in the NFL. But Lynch has the higher percentage of success IMO which is why he'll be drafted well before Cook and rightfully so.