Yes, once you mentioned returning to the End of Time later and I realized that such a thing was not possible unless I changed all my plans for Garg, I came to that same conclusion. Garg would probably be a more useful tool if he had no idea what the bigger picture was, because he cares more about his own personal glory than whatever may be in the future's best interests. So, unless I decide to continue using him in some future subplots (which I may, if some other subplot has opportunities that I feel fit his character), that will probably be the case. Which means someone needs to be sent at least to start Garg on whatever path he is most useful for, if not work with him the whole time.