Draft at least two O-Linemen earlyish

I rarely disagree with your take on things, but there's little difference between the Saints and the Lions approach:-

Taylor Decker LT, 1st
Graham Glasgow LG, 3rd (drafted same year as they took Decker in the first)
Frank Ragnow C, 1st
Kevin Zeitler RG, FA (former 1st round pick)
Penei Sewell RT, 1st

The difference is that the Lions are doing it better. All those skill position players they have are enabled by that line. They made Jamaal Williams into a TD machine, here he just runs into brick walls.
Agree the "build the line first" approach used by most of the successful NFL teams. YOu think mahomes would be successful if have had 1.2 seconds to throw the ball like Rattler did last night. J Love had enough time to make every read and then throw to a completely wide open reciever. Can't remember a tight throw he had to make last night.