So with the new...interesting...jungle pathing, ranged ADCs can do the jungle without taking damage.
If you have an AD carry jungling, then not only do you not need a ranged ADC in bot lane anymore, you also need some bulk to compensate for a squishy jungler.
With someone like Vayne in the jungle (because she probably has the best combination of ganking and clearing ability of any of the ADCs that can do this trick), doing a double relic shield kill lane in bot becomes a possibility. Stuff like J4+Pantheon can be incredibly scary to enemy AD carries and supports early game, especially for immobile bot laners. Having two relic shields allows both members of the bot lane to get enough gold to function. I mean, Pantheon's gonna fall off late game anyways, so does he really need a full gold stream?
This exploit is going to get the living crap nerfed out of it in the next patch but until then we might as well abuse the crap out of it.