I had a tri-leaf once myself. Having grown hundreds of plants, mostly outdoors, I can say definitely that tri-leafs are very rare indeed, and in the case of the one I had, I was lucky enough to have it be a female, and it was way productive indeed. I do have to agree with cOrd in that I don't understand why you would top especially if plants are as young as those in your pics. Topping outdoor plants might increase bud sites, but you have denied yourself that wonderful donkey dick top bud that outdoor grows are famous for.