I'd wager the reason these guys are passing is because they all want someone else to be the "fall guy" for the Saints cap sins and aging roster. Once the Saints clear the cap and the new HC doesn't have a tier 3 at best QB with a tier 1 cap hit, I bet they'd all love to work for a franchise with a GM who does whatever is needed to sign the guys the Head Coach wants and an Owner who just wants to sign checks and smile for charities.
The fact Underhill had this article ready to go for this moment says a lot.