Like i said in the original post. The attack power only applies to PVE, not in the PVP crucible matches. PVP damage is based on your weapons IMPACT rating. The Level Advantage is damage resistance to lower level characters/weapons. In the normal Crucible matches the Level Advantages are disabled so everyone has the same amount of health/defense. Compared to IB which the Level Advantage is "Disabled." This is misleading, it is not exactly disabled, it is just looser. Your gear defense will offer increased protection, the more you have on, against lower level weapons. It is not to the full extent like PVE because then it would make IB only possible to play for the top level players. Although the damage hits for about the same between normal Crucible and IB, in IB you can essentially take more hits before dying. It is a small increase but it is there, the only problem is that most people will never notice it. The videos for this are very misleading as well. It is very hard to compare damage through one players point of view. If you could get a side by side of comparable weapons and armor and see the damage hit markers and damage taken from each shot to the players health bar, you will see a difference in IB compared to Crucible.