Not sure why he would do that. If anything, his time in Philly has taught him the value of a great OL from the drat, great DL from the draft, great WRs from the draft, and that you can get a great RB relatively cheap in free agency.
You can get a good RB anywhere. But someone like Kamara in his prime is a game changer. You don't get those anywhere. If you don't take them when you have the opportunity, you spin up thread after thread about how the Saints could have drafted him.