I actually didn't see my inclusing in BG's WSG or AB as detrimental to the team once I got a grasp on the team in PvP.

The teams strategy has to take into consideration your presence. Generally in AB the first thing I would do was say "I am multi-boxing, the best strategy we can employ is 3 cap Farm, BS, LM and I will just sit between all 3 and go where the pressure is heaviest". That is the typical strategy, so more often than not that is exactly what we would do and we would win easy 3 or 4 caps. When the team I was on was not interested in defending at all we struggled. In WSG taking up 5 slots isn't be big deal imo. Your best position will be as a 4, flag escort and defense, or flag offense. Either way you are not taking too many slots up as a 4 man or 5 man team. I'd argue a 5 man DK squad on offense in WSG is going to be the ultimate sniper team to pop the flag runner and grab the flag back.