There’s probably a level you could drop. I think tankathon has McCarthy 12 to Denver; sounds possible.
But if the Pats like McCarthy (in this scenario) enough to take him 12th or whatever via trade down, you have to assume he’s in play somewhere before that.
It’s so hard to project the non elite QB prospects. We’ve seen guys like Levis, Willis and Ridder (and Hooker) slide much later than many “experts” projected. Lamar Jackson and Bridgewater to the end of round 1. But then you have guys like Ponder, Weeden (ha) go much higher than they should have (as prospects and in retrospect)
it’s tough to project because the first half of round 1 usually has a lot of bad (and often QB needy) teams who might think it’s too high for a “non premium” QB and the second half of round 1 is playoff teams looking for that final piece of the puzzle to get them into the Super Bowl. So you get these weird slides sometimes.
Regardless, if you’re taking a QB in round 1, he’s a 3 year commitment usually and you don’t want to tie yourself to a guy who you don’t believe can be the franchise guy. And if you do believe that, trading around hoping to grab extra picks and gambling that nobody else loves him the way you do is highly risky and not worth it. It wouldn’t shock me if a 4th QB went top 8 and the Pats IMO simply cannot go into the draft with pick 3 and exit without either a potential franchise QB or Marvin Harrison (who I don’t really want but they need a true potential superstar). If you trade down to 11 hoping to get your preferred QB let’s say and someone jumps you for McCarthy (or whichever), Harrison/Nabers/Alt are all off the board, you’re screwed.
Generally speaking, moving around and taking lots of bites at the proverbial apple is a great strategy. I think it fails when you’re in need of a true superstar at a critical position.