Everyone in the world knew that Marshawn was on the trading block. As others have said, all the Saints had to do is call.
It would not surprise me if Greggo is the source for this.
Glazer presumably is just reporting what he was told. Yet, there is no getting around the fact that all the Saints had to do is call. Everyone on this board and in the NFL knew that the Bills were looking to trade Marshawn.
Maybe Glazer's story should have been why didn't the Saints call the Bills. If they had traded for him, he would not have had that run against them.
P.S. Just for context, I am one of those people who thought that, if the Bills were going to trade Marshawn, they should have traded him for more than they did.