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I think the difference between Haener and Rattler is that Haener throws w/ anticipation and seems to have better post snap recognition. He plays like a guy who's been in the league for a year.
Rattler plays like a SITI QB, that's still a rookie. If the throw isn't clean he'll hesitate or hold the ball too long waiting for it to come open. I've said this a lot, he's not a Point Guard or spread the ball around QB, he's a guy who needs a #1 WR that he can lock onto, that wins 1 on 1's a lot and can make contested catches. He plays better w/ bigger WR's that have a large catch radius.