The fact that Deion made game changing plays as a returner on a routine basis made using him on special teams make all the sense in the world.
Sanders with the ball in his hands was a touchdown waiting to happen. In 1998 he basically beat the Giants by himself with a long catch, a punt return TD, and a pick six. A year later against Washington a punt return TD by Deion clinched the win.
Saying using Deion Sanders on returns was stupid is like saying it was stupid for Dante Hall and Devin Hester to return kicks and punts. Like Deion, that was literally their forte'.