She could not be certain of when he had arrived from, but from what she understood in her conversations with Doctor Keller, only herself and Carson's presence would be a surprise.

"John's last memory of Atlantis is the Wraith siege, shortly before we first met you. Teyla comes from a time shortly before myself, as does Doctor Zelenka." It was best, perhaps, to allow John or another who knew Ronon better to explain how John would recognize him. "Also...Carson is here. From not long after John."