I don't have an opinion on the deluxes, as we've never stayed there, and it depends what you plan to do.
But, if it were me, and there was any way I could switch that one night deluxe to the end of my trip instead of the beginning, I would do that. I just think if you go from somewhere as amazing as the Poly and spend only a short time there, you will never hear the end of it all week while you are at POP.
I think it would be a nice way to end the trip, and something for everyone to look forward to.