This is super interesting. In case you guys are as intrigued as I am, I just flipped two of the cuts I took from my purple Durban from my first DBHBB grow.I think so.
It's gotta be just another one of those recessive gene combos. When they're mature, they'll try to bloom. The problem is that growth will slow too. It doesn't completely stop, but no good happens while it sits in limbo either. I was relieved that mine stretched some anyway.
The previous cuts hadn't done it, so it caught me by surprise. My guess is that it's another example of epigenetics, where a new environment will trigger genes to turn on or off, causing the clone to grow differently from its mother. I have a Bubba Hash cut that decided narrower leaves were better in my environment, for instance. It's 3rd or 4th gen in my garden now.
You might recall, we noticed purple pre flowers as she started to stretch and I took the cuts. Fast forward nearly four months and they were finally rootbound to the point I had no choice but to upcan and flip.
They just went into flower on Monday but here’s the interesting part, the pre flowers don’t look purple. This will be an interesting test for me on a couple ways. First the color of the buds may exhibit the plants adaptation to its environment as you guys suggest. Second, the maturity of the cuts are such that they looked like they were bursting to flower. It will be interesting to see if the slow down and stretch less.
Cheers!
I’m doing my best to maintain, what I've started referring to as, my microclimate in my flower tent. My veg box on the other hand is not climate controlled, at least not as much as the flower tent.
Given what I’ve read today, if what we are all suggesting is true, it would be near pointless for me to keep a plant as a mother based on what she might’ve shown in flower.
For example, let’s say low nighttime temps are what caused purple calyxes on my Durb. If I don’t somehow recreate those conditions, they might not purple up.
Wouldn't hurt to pass a little air across 'em, if it's not too much hassle. I turned my ventilation off for too long once and ran the room up past 40C and triggered the thermal breakers on 2 of the drivers, so you'll know when they get TOO hot. 
Enjoy the weekend ..say hello to M for Mare and i.
..maybe a laugh , or three..
There's something about this strain that calls to me, so I'll run it yet again - got a small one ready to flip.
Thanks Gray 