The top 5 defense isn't terribly far fetched, but he's putting an awful lot of faith in Joe Lombardi's 'system'. It will take more than Stafford stepping for those numbers to happen. I also don't see it but would be ecstatic if the offense came remotely close to those stats.
Top 5 PPG is not far fetched for the offense that is loaded with talent.
Stafford is good and has led a top 5 offense before and played well enough in 2013 and 2014 for a top 5 offense. Calvin and Tate are elite and healthy
We upgraded protection (with draft and health) and run game big time this offseason
Year 2 of the system, plus Lombardi can learn from mistakes
Moore can be solid
Ebron is talented and in year 2.
Everything points to top 5.