First Grow: Sour Diesel (outdoors)

SD has exploded with budlets this week. Every branch has filled out with tons of buds. Branches have hardened up. She looks to have surpassed the bagged GC. I've noticed that like the two bagged GC, she has "duck feet" leaves - 3 fingers. From the little I've found about this, there are three options: 1. Genetic trait. My SD doesn't share genetics with my GCs. 2. Stress response to heat or something else. 3. Concentration moves to creating flowers, rather than creating five-fingered leaves. - This is the one that I think fits. All eight plants were hit with powdery mildew, all have been dealing with sporadic bouts of extreme heat. My BDs have been mercilessly pruned by me to alleviate the mildew growth and because they're enormous, but none of the other six plants are showing three-fingered leaves.