You realise that IFP only includes characters seen in WCL, right? So if you are not raiding or not PUPLICLY logging your raids, you will not count.
You also realise that Horde has enormous Q-times on Classic…you cannot raid while you sit in a Q. As Alliance it is perfectly possible to do your raid and then Q up for your quick daily loss afterwards. The same is not possible for the Horde with their daily win.
So it is logical to assume that a large part of the active Horde AV population does not appear on IFP at all. They cannot raid. They have to sit in Qs.