Draft at least two O-Linemen earlyish

You and me both. In fact, I'm even irritated you reminded me of that draft. I was so incredibly mad they didn't trade up to get Jefferson. It was only like 3 or 4 spots if I remember correctly. Then they take Ruiz while they're were some obvious great players on the board like Brandon Aiyuk, Patrick Queen, Tee Higgins, Winfield Jr. IF they absolutely felt necessary to go with a Guard, Robert Hunt was right there, available. Anyone who watched both Ruiz and Hunt new that Hunt was much better.

I really don't understand what the hell they were thinking in that pick. To this day I wonder if that's the point were Sean knew he needed to get out of New Orleans.
Payton was the driving force behind drafting Ruiz. He blamed Larry Warford for the playoff loss to the Vikings. Warford also carried a gigantic cap hit that the Saints wanted to get out from under. You also had Michael Thomas coming off of a 149 catch season. Sean seemed pretty comfortable plugging in a Ted Ginn/Emanuel Sanders type as the #2 guy.

The mistake wasn't picking Ruiz, it was giving him a second contract. They should have realized that his best position is center and tried to trade him after his 3rd season.