One thing I noticed is that while Marrone was the Saints OC from 2006-2008 Reggie Bush (a poor man's CJ Spiller) had a ton of catches.
http://espn.go.com/nfl/player/stats/_/id/9588/reggie-bush
88 in 2006 and similar paces the next 2 years although in less games played. He's never had 50 catches in any year since, including 2 more with the saints after Marrone left. Obviously, Marrone wasn't calling plays and it's tough to tell if he had any input in that trend, but I found it interesting nonetheless. Getting Spiller 80 catches in 2013 sounds good to me.