I recall having this discussion, which at some point turned to argument, about whether or not certain items are "weighted" to drop more often. Obviously the weighting factor is built-in to the game to account for targeted loot, so the mechanism is already in place, but some folks argued that (outside of TL) it's pure RNG and there is no such weighting involved.
So about a year later, exotic drops in the LZ are still running 92% toward the Chameleon. Yes, in the (almost) two years since I first noticed this I've had more than 9 out of 10 "random" drops in the LZ were a Chameleon.
Well, now that I've been farming the DZ a lot for optimization mats, I notice the same thing for Pestilence there. Since I went "back in" I've had 32 exotics drop, and 31 were a Pestilence. That's more like 97%.
So almost nothing but Chameleon in the LZ, and almost nothing but Pestilence in the DZ. Does anyone still believe this is pure RNG, and that the devs don't weight any particular item?