I play on kaiser sever splid, most of the friendly BB5's go north and support for south is generally thin so im used to being outnumbered don't mean you have no chance to win, but sometimes when your CV runs north and you are camped you are a bit overwhelmed. doesn't happen often just saying it CAN happen.
I always go south unless a bb6 with 1-2 bb5's go with it and then ill cover the other flank to balance it but sometimes they get stomped so yeah it just depends on how poor the support is sometimes.
Also when im usually surrounded is when im the last bb left because the rest of the team died off, i usually can kill a couple more bb's before i sink.