That’s a low bar because we haven’t drafted any in the first three rounds. That’s not even trying. Especially these days where only a handful of QBs drafted outside of the first round are starters and most of those were drafted a decade or more ago. Purdy is really the only recent one and I don’t think he’s great personally. The odds are Rattler isn’t going to be anything more than a backup if he’s lucky.
But to answer the question the best has been 2000 6th round pick Mark Bulger. He never got a real shot with us since we had Blake, Brooks and Delhomme in camp. Good starter for the Rams though.