I'm no botanist, it might be possible for two different males to pollinate the same plant. What a slut LOL. But seriously, I grow in groups of six plants of the same strain. It never fails that out of that group (all cloned from the same plant and therefore genetically identical) there is always a runt and a beast. What I mean by that is four of the six will grow to the same height and then one will be taller than those four and one will be shorter. You can't tell from my journal pics because I put plastic bins underneath their pots to even out the canopy. My plants are turned and their positions are rotated frequently so it is not from different lighting. I think it has a lot to do with the individual and unique root structure of the plant. Some plants grow root structures that may function more or less efficiently than average. But that's just my opinion.