In the several horde premades I have faced while in a zero res. premade, we have still won. I don't doubt there are other ways to run a wsg premade, sometimes we'll all rush the flag as a group, and then zerg the horde FC on the way back to our FR. It just depends on who's running the premade, and what the group make up is.
IMO the way they are run most of the time, with a mid-field defense and 2-3 people (usually a druid) on the flag, is the most expedient way to get in, and get out. WSG has the awful reputation of dragging on for long periods of time, I have seen 3/4 of an original 10 man raid leave and get replaced due to a stalemate.
When we are running the premades, we want the fastest, easiest way to get in and get out of a BG. Honor/marks per/hour is where it's at. While it may not be the most exciting, it gets these goals done and builds Silverwing reputation at the same time.
You are more then welcome to open a premade WSG at anytime and run it any way you want, if you have fresh ideas that can still accomplish our goals and interject some excitement into things, then I am all for it.
I will check out your link!