Sif/Fandral/Thor
Not everything uncommon is dangerous. Were I Gamora, I would send whomever was of least use to me through first to ensure it was safe to follow. Perhaps they have no way of contacting her now that they're here.
The little beast says he expects Quill's arrival, and that he doesn't expect Quill knows our precise location. Perhaps they're trying to locate the tesseract this way.