Because their offensive roster is putrid. Right now Hoyer is most likely the week one starter and they have a rookie kicker too. Belichick I don't think will let them lose on purpose out of the gate but if they start out 2-5, I can see him pulling the plug to get Lawrence. They would be foolish not to.
You guys sure are high on Rivers. He looked awful last year with a loaded team. He will continue to be a turnover machine I am afraid. Would not be surprised to see him benched at some point for Jacoby. The South is still Houston's division to lose with Tenn nipping at them.