As MHippie pointed out, all about
poor genetics.
I'd be really interested to see the response that a pure ruderalis has to topping... although that, too, might open up a can of worms and beg the question of...
If ruderalis really
is an indica variety/strain that acclimated to harsh northern (or high elevation) climates, will they then have the chance to express those indica traits when given the appropriate conditions..? And, thusly, fuck up this whole hypothetical situation I have in my stoned-ass brain..?

Sorry to dive into this in your journal amekins...