That can definitely be the route, you're basically coming in off Afton Canyon Rd. That said, the true "start/end" of the trail is further west at Camp Cady. I think most people skip that section as there's not a lot to it, but you know... if you're a completionist you may want to check it out

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Edit: was there a campsite location for Friday picked? I thought the spots posted previously were backside of little cowhole mountain, just past the purple/red line intersection. Not sure it makes sense for the group to camp that far north (orange/purple intersection - prob 30 mins off the trail each way).