The route across direct to Sandy Heys, then direct to Edale, was the original trigger route (no restrictions in route betwwn Marsden - Black Hill - High Shelf - Sandy Heys - Edale) route. I've never run it in that configuration though.
The edge makes it a bit of a different race, you can move quickly over it if you've paced well, and there's much less chance of getting lost. Of course in 2017 it was ankle deep slush and icy drifts every 50m and was purgatory.