The rest of my plants look way more full
Plants are just like people this way. Some people have blond haired blue eyed parents and siblings but have raven hair and brown eyes, or even the occasional ginger. Only way to have “identical plants” is to clone and even then they still might have one be leaner then another. I had a grow few months back of BB autoflowers. All 4 from same nute solution and in the same tent, even same bag of seeds 1 green, 2 purple and one specled purple and green.
So then this pretty normal. This is my first time ever growing and I wanna make sure I shouldn’t cut this thing down or affect my other plants.
Your killing it for a 1st timer! They look great! Wish I could do outdoor. Yeah totally common. There are different levels of genetic stability which can minimize the amount of different phenotypes displayed, sadly Ive not put any time into understanding it yet. Im fairly new myself, 17 months growing now.