Most Helpful Girl
well it would be awkward or rude to not acknowledge the others. it's always hurt my best friend when men approach me right next to her and don't even acknowledge her presence. it turned me off, so it might turn your girl of choice off as well. but this is just my instance.
Most Helpful Guy
Ignoring the group but you on their shit list even if you land the one you want. If you can't find her away from her pack getting a good first impression on all of them with help you land her.