Using stardiver at the start of a fight is going to cause more damage through the added effect than the difference between it and drakesbane. So technically this WS already beats drakes in party situations.

The dev team mentioned with he release of drakes that they intentionally boosted the WS bc they felt drg needed a great WS. And it is still one of the best WS in this game.

Club and staff new WS are better than the previous because the others aren't much good to begin with (aside from hexa strike but that is main job specific). So those weapons deserve to finally have a good WS. Now drg has 2 WS that it can rotate between depending on the situation, this WS is fine by me. (Of course i won't complain if they boost stardiver either, i just don't think its necessary)