My guess is that they will add Dex to the shared gear (coils/CT etc) and each class will just have a somewhat useless stat when they equip it.
Or Some skill to swap str or dex. Regardless, it was a really convoluted answer that needs to be clarified by somebody. They could be looking to branch slaying accs off into 2 sets, one for nin/mnk and one for drk/drg, with aiming going for the new rng.