It seems that some GFs were able to stack 2 KValors on the party if one has 3 points in the power and the other has 2 points in it. It ends up wrecking enemy teams in PVP and bugging out damage in PvE.
In additions, as other have mentioned, it procs the Blue Dragon Glyph on everything that touches your team. Just check what some people on first pages of the Leaderboard are using. You don't need 2 GF for that, but if both have it - it just makes the whole PvP that much more bugged.
so it went from gwf stack to gf stack? Soon pay to win SW stacking too... Suppose these types of things and the fact that a pug pvp group can be set against a pre-made group, are some of the reasons I don't really care for pvp. If you queue for pvp with a friend or two then you're gonna have a bad time
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http://youtu.be/GKW1BG_Jxl0