Sora was surprised that someone else could wield the keyblade beside him (Riku), so he thought that if someone connected to him like Riku could wield it, what about Kairi?
I'm having a real hard time making heads or tails from this post. The shock should've ebbed away by then seeing how Riku took the Keyblade away from him as soon as they got to Hollow Bastion. What do connections and Kairi have to do with anything? (asking seriously as I do want to know wtf you're on about o.o; )