Red Route starts with Onion's route until Ennis Lake where it starts following Brian and Martina's route the rest of the way.
Onion's route until Yellowstone is included in purple and I've added a number of my own alternates since I want to link up with Tapon's Teton Route.
Onion's Route: https://www.ocf.berkeley.edu/~garret/cdt/alternates.html
Brian and Martina's Route: http://www.wildernesstravels.co.uk/cdt/bigsky.htm
...hopefully someone finds this useful.