genetics .. seems to happen when rails of trichomes form along edge, in my expeience. otherwise the typical things that can cause "tacoing" can be ruled out to be more certain. plant looks healthy in that 1 picture, though, so as longn as it looks healthy i'd go with genetics.
you can't force this sort of trichome development... we can only impact small percentages. like red vs blue wavelengths.. yes one promotes axillary growth but it's not a huge impact. important to know scale of effect to deal with it appropriately. you'll never be able to force feed aplant like foie gras and make this outcome happen... only some plants have this trait... it may or may not be correlated to good things.. you'd need lab equipment and large sample sizes to compare to a control group of some sort to discern... devil's advocate .. what if all the leaf trichome development leeches from buds? probably not true, but can't just assume cause and effect cause we like the outcome either.