It looked like it was maybe going to start branching out too!
I'm getting ready to start some from seed again. I lost/gave up on all mine before moving a zone colder a few months ago. The ones I lost were all to root rot...some while sitting in a bone dry pot over winter! I've had a similar situation with my jade in winter on occasion. It seems some fungi in my local ecosystem can get into the good bits and suck them dry while they are dormant
If I can get to the point of overwintering these guys again, I think I might try some pre-treatment of fungicide to see if that helps.
I have some doubts about getting these guys growing again though. Springs and falls are much cooler and damper here than in Kansas City and I don't have the same kind of indoor space to shelter them.
As for yours, I wonder if the tie down wire could have injured the roots and contributed?? I never tried to tie mine down.