It's pointless trying to say who is better. They are all good. It still takes good play around them for things to work. Receivers need to get open and catch the ball, linemen need to block. If those guys do their job, then all can be really good.
No doubt QB is important, but to me it isn't the most important position in sports except that it is possible for them to play every game. From a pure domination standpoint, a baseball pitcher or hockey goalie are more impactful than a QB.
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