2 ghost pepper plants 2 different outcomes

I got these two Bhut Jolokia Red plant at the sametime. The one with a pepper looks pretty much the same as when I got it. The one without a pepper (and keeps dropping flowers) has gotten pretty big.

Both fertilized with the same stuff. One in a pot on its own (big) and one in a bed with other peppers and some potatoes.

I'm happy with both plants. I plan to try and overwinter both but I figure the one that is absolutely popping off with growth will be better for next year than the one putting all its effort into growing two peppers.

Zone5a