Winston is a blue chip, potentially generational QB. He still 23 and has had two nice seasons. Like Carr, I expect him to explode this season (his third). He's better than Kirk. Not debatable to me.
Today, Dak is better than Kirk. Last season he was better than Kirk. Kirk hasn't had a season, yet, as good as Dak's last, ergo, he's better. "TODAY." Until proven otherwise. Also non-debatable for me.
Kirk is wreckless, buckles under pressure, and takes a game or three to get going. He's a league average QB and has already hit his ceiling at his age.
Alex is fiteen'ish, slightly below Kirk's 12-15 ranking, imo.