Saints have never had a bell cow (except for that four game stretch last year), but they use 2-3 backs enough they're still fantasy relevant.
I have generally been on board with this line of thinking regarding Payton and the Saints however this off-season really seemed to come out of left field when they let Graham and Stills go (their top two receivers from last year). I think Payton
wants to run the ball more, whether or not he can get out of his own way to accomplish that is another question entirely but I truly believe that the desire is there.
When they won the Super Bowl in they were 7th in the league in rushing attempts (468), 6th in yards, 3rd in TDs and 7th in Y/A. As you pointed out the division of carries was pretty equal between Thomas (147) and Bell (172) and the division of overall RB touches was pretty equal between Thomas (186) Bell (176) & Bush (117) so even if Payton sticks to the run you could still see a similar split between CJ, Ingram and Khiry.
But either way I think the Saints will be running the ball a lot more this year which makes the backfield a little more interesting than it has been over the past few seasons when they averaged 395 rushing attempts per season.
Based on the data I posted earlier and my expectation that the Saints can't stop anyone, I expect Spiller reception floor to be 45, but I could see him easily catching 60-65 balls this year for his ceiling.
Historical data for the Peyton era in full PPR on a PPG basis:
2006 Bush RB10, McAllister RB18
2007 Bush RB6
2008 Bush RB10, Thomas RB21
2009 Thomas RB17, Bush RB28
2010 Thomas RB16, Bush RB36, Ivory RB43
2011 Sproles RB10, Thomas RB27, Ingram RB41
2012 Sproles RB8, Thomas RB39
2013 Thomas RB21, Sproles RB31
2014 Ingram RB12, Thomas RB27
Buffalo during Spiller's years there:
2010 Jackson RB26, Lynch RB42, Spiller RB66
2011 Jackson RB4, Spiller RB33
2012 Spiller RB9, Jackson RB28
2013 Jackson RB13, Spiller RB32
2014 Jackson RB16, Spiller RB52