Nobody IMO.
A truly elite QB is almost always going to be top draft pick. And many top QB draft picks still don't even work out. But the QB position is so, so heavily scouted - even when compared to other NFL positions that are looked at 24/7 by scouts - that it is hard to find guys slipping through the cracks. It is why I hated the Stetson Bennett pick. I hate drafting QBs in the mid rounds. If you draft a guy early even if you plan to sit him at first - Jordan Love, Aaron Rodgers, J.J. McCarthy, Penix - I can see that. But to take a QB in the mid to late rounds, at that point, you're 99% chance strictly drafting a backup. Why
draft a backup QB, when you can
sign one in free agency - and maybe even one that has actually proven he can win games in this league (those guys tend to cost more, but there are always a few out there - we just snagged one in Jimmy G). Spend the draft pick somewhere else. You can find plenty of defensive starters in rounds 3, 4, 5. Heck, offensive starters too. We found Puka late! Imaging taking someone that projected as a career backup QB instead.
If/when the Rams lose Stafford, I expect them to be extremely aggressive when they identify a QB they like becoming available, be it via trade or free agency or coming out in the draft, and will probably "overpay" to get him, which I am 100% good with because I trust their track record in QB evaluation. Snead did it with trading up for Goff. And did it again trading Goff and picks for Stafford. When they brought in Baker he was awesome, and lo' and behold, he is now an upper tier starter - though not quite elite. We might go bridge QB if nobody they like is available. But long term, I expect to have to pay a heavy price. I don't think the Rams under McVay will ever lose enough games to get a top draft pick naturally, barring absolutely catastrophic cluster injuries tanking the season (which we did actually see recently).