Will Grier doesn't have the same arm strength as Kyler Murray, for starters. And before you get on about arm strength not mattering, I'm talking about the fact that Grier very rarely displays the de minimis velocity at NFL distances that you will generally need when throwing in the NFL. The guys who get away with not having that are typically old enough for it not to matter. For a young guy to walk in having to make decisions THAT much faster than your average NFL starter, while maintaining a level of acuity in your decision-making (not being careless with the football)...is very often way too much of an ask.
Kyler Murray is just a better passer than Grier, period. Arm strength aside. Has good touch. Can get the ball out with pace when he needs. His deep ball is extremely attractive, one of the more attractive deep balls we've seen over the years. His throwing process is a lot more consistent.
The mastery Murray displayed over Lincoln Riley's offense only being a first year starter, was pretty amazing. What you won't catch on a highlight reel, or even a collection of Murray's passes and runs, is how much his hands were all over the OU ground game, and how LITTLE he needed those pre-snap adjustments to come in from the sidelines.
Something you MAY catch on those highlight reels, but will probably miss, are his EYES and BRAIN during the pre-snap period.
He varies his cadence, uses his hands and voice excellently to try and draw the defense off-sides, or more importantly to try and draw them into giving away their blitzes. He sees the barest of movements and is able to ID the blitz, alert his players, and then modify his drop to account for the pressure, get the ball right into the vacated zone.
Sometimes he doesn't see a movement at all, but something off film study or the convenient spacing of a certain alignment will induce him to alert his protection to a possible corner blitz, or some such. Pro attributes.
