I did this route going up with overnight packs on an Avalanche/Garnet loop. It featured some lovely Teton scrambling. Being comfortable with class four or low fifth and more exposure makes the route finding easier. I didn't have detailed beta and just sniffed my way up without much difficulty or doubling back (going down would potentially be harder). I always would rather have steeper more challenging scrambling if the rock is more sound. If class four is near your limit it might be a tougher go. I thought terrain on The Fin in the Pioneers is as challenging as much of the west aspect of South Teton. We, too ended up merging with the Standard Route before the summit, which seems like it would have been somewhere close to the northwest ridge and maybe one or two hundred vertical feet below the summit.