Who was the best Saints running back to be efficient at the screen pass not named Pierre Thomas?

Out of the choices you listed for me it was definitely Sproles.

His contact balance was amazing, he was already a low to the ground runner but once he was able to secure a screen pass he had the ability to dip, and slip under Blockers, sort of hiding himself from Defenders throwing their angles off just enough to make them look silly, plus he was really nimble and quick.