I don't believe I said anything about you discussing him, so I'm not sure why you responded as you did to my post. I was actually making kind of an inside joke with cindersoot, who has long had "problems" relating to TG, going back to the earlier days of this case.
Regarding your post, there was much discussion in the earlier threads regarding the bikes, and who they might have belonged to if they didn't belong to the girls. We debated this back and forth, IIRC, but as usual there were various theories and no consensus was reached.
IMO, if TG did see bikes that day, they could have belonged to anyone. As to why the owners did not come forward, we don't know that they didn't. I doubt LE would publicly name the owners if they did not wish to be identified.
LE has never officially recognized TG's sighting, and thus have not commented on what bikes he did or did not see on July 13.