When drafting a quarterback in fantasy football, absolutely nothing matters but upside. This general dictum holds true in 99% of fantasy football leagues. There are some examples (16+ team leagues or massive Superflex leagues) where this is not the case but chances are, in your league, you just want to draft for upside. It doesn't matter if your quarterback gets injured or benched or traded because there is likely a waiver wire replacement readily available. Lamar Jackson is the perfect example of this dictum.
In 2018, 21 quarterbacks averaged 17 or more fantasy points per game in a standard league.