I don't know, maybe you're right and Stafford deserves to be higher. But stats in the NFL are so misleading, QB's don't perform in a vacuum. Their performance is so heavily dependent on external factors.
Having the best WR in football on that team, catching passes and drawing defensive attention, helps every other person on that offense including the other WR's and Stafford himself.
I don't think the talent gap between Jay and Stafford is so wide and I hope Jay will prove that this year or next year. No more excuses.