Clowney vs. Manziel
Insane that a man that big and that strong can move that fast.
I feel that having the longer legs can help him move at greater differences, if the 2 men have similar "leg speeds"
JFF's pretty fast in the 40, but where he separates from other mobile QB's is agility, shiftiness, and improvisation off of those. Decent Zip and Accuracy, but accuracy might come from being able to run around for 6-10 seconds (longer than most QB's have to throw), long enough for any secondary to lose coverage downfield, which gives him wide open targets to hit.