I don’t think it matters too much, it’s really just a dynamic drill/warm up thing anyway. To each his own. You can’t argue with Pfaff’s success or influence over other track and field coaches in multiple events. It’s kind of like should you put the feet high on the pedals or put the feet with just a little touching the track…WR holders have done both.
As stikki said, with drills you are moving about the same speed as you do when you walk/jog. You don’t walk around on the balls of the feet. You don’t do tempo on the balls of the feet. For him drills are a dynamic warm up and for teaching body position/awareness and he doesn’t really believe technique is getting enhanced by drills, similar to Tellez.
Personally I say do whatever feels natural.