Like others have mentioned, who really knows if Nagy has a true "system" but we have to believe it revolves around running the RPO – which KC / Reid / Mahomes have done successfully over the past few years. This has swept over college football, so to some degree, these prospects should already be familiar with this type of system. However, running this offense is a different story – since it really demands a lot of quick thinking for the QB in a short amount of time – plus the QB better be quick with their feet and be able to extend the play. Looking at the draft there are 4 good prospects: Fields, Lawrence, Wilson & Lance – that fit that criteria.
The two best QB prospects from a pure RPO system would be Lawerence & Fields. I'd give the nod to Fields since I feel like his agility & strength translates better to the pros – no knock on Trevor, he'll be a great QB too.
Wilson ran the RPO well at BYU but they also utilized a lot of bootlegs and at times relied too much on his natural playmaking ability. Hard to tell if he'd fit Nagy's scheme, but I think of him as a Kyler Murray / Russell Wilson type.
Lance would probably rank last out of the top 4 or 5 QBs, since NDSU ran tons of half-reads. This means that the offense is running mirrored routes on each side. So theoretically the QB only has to read "half" of the field. Because of this, we can't accurately gauge how well Lance would do with more complex progressions. I like his play-making ability and agility, but I feel like we're circling the same drain that we did with Trubisky.
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The QB that would best fit the RPO and could be made available if the Dolphins are seriously considering making a change, is Tua Tagovailoa. I would strongly go after Tua, even if it meant facilitating a 3-team trade with Houston & Watson. If Nagy is serious about the RPO, he's their guy. Get Tua to play the QB, then move up to draft his WR Devonta Smith, and snag one of the OTs later in the draft ( Eichenberg, Brown, Radunz ) and you've changed the makeup of this offense.
That said, they'll probably just shit the bed again.