Cybele has a Super Sniper Shot that also damages targets, and she attacks 2-3x per turn guaranteed. She's simply superior to the other attackers available to Wind, both in utility and damage. A team can typically only fit one kamihime without an essential debuff, so that one character needs to be truly exceptional. For Wind, Gaia's usually going to take that slot. There's no room for straight attackers unless their damage potential is amazing or they can buff Shingen and thus enable a Burst build (e.g., Titania).