Nice man....its probably just a runt, like inferior genetics or something. i had one do this once and it was because i had put the seeds into small baggies with a half cup of soil and when i transplanted it outdoor i forgot to poke holes in the bag. So it had no room for root growth.
You should totally just let it back into veg for a couple years and see if it does bonsai.....i'm pretty sure you can do it with all plants.
i always have been curious about keeping a really small mother that would eventually grow a huge trunk!