What exactly happened to Don Elkins?

[Patrick]

...Jim and Carla entered the path of STS (in their distortion of STO) just like Ra predicted in 67.8...

I believe entering the path of STS, as in putting one toe on it, is easily done. Each choices we make is where we put our foot next. During our incarnation, each of us, we put our foot on the STS path many times. That does not mean we have made the Choice of walking on the STS path per se. Our actual Choice is made by how often we put our foot down on the STS path versus the STO path and which one becomes our preference/bias over many lifetimes.