Can we get a look into blackrock queuing battle grounds

I like pvp. I join battlegrounds alot. Everyday several matchs in a row blackrock server will be of an even number on both teams at the start of the match. Then all but 1 blackrock players will leave the battle ground off of 1 team leaveing that team short handed by 3 to 4 players. This happens right before the match in the 1 min countdown of bg start. Or withing a min of starting the bg. I know that dosent mean much but then you'll see the players who left by join the other team with exsesive ques. And it leads to one team being with say 5 or 6 blackrock players and the other team with 1 or none.....there are times in the day when this is so bad our team will start full but because of the blackrock dropouts and the frequency of their reques just to drop out again.....it leaves 1 team short 3 to 4 players the entire match.and this is just in 10v10. So 3 to 4 players short is a lot. To be clear I have seen the drop from my team and reque drop out again and reque again till they get on the other team that already had the most blackrock memebers.