There is an easy compromise average rating divided by average crowd. The higher the combined average, the higher you rate as a guild.
Or the leader/right hand could put their guild into the pot with certain conditions put in place (average opposition rating/average crowd rating/size (number of members) of guild etc) and they could be matched up accordingly when opposition becomes available.
Also time wise, the time it takes the first guild to find opposition should be taken off the 24 hours it takes to get ready for a GvG. So if it takes six hours for opposition to be found, the GvG would start 18 hours not 24 hours later. Obviously there would be a minimum time just in case it takes 24 hours or more to find opposition (which is not unheard of).
Or the leader/right hand could put their guild into the pot with certain conditions put in place (average opposition rating/average crowd rating/size (number of members) of guild etc) and they could be matched up accordingly when opposition becomes available.
Also time wise, the time it takes the first guild to find opposition should be taken off the 24 hours it takes to get ready for a GvG. So if it takes six hours for opposition to be found, the GvG would start 18 hours not 24 hours later. Obviously there would be a minimum time just in case it takes 24 hours or more to find opposition (which is not unheard of).