I was reading a book about Dean Corll's crimes recently, and I read about a victim's mother being turned away by police because it was believed her son was "just a runaway". He had went to the pool that day with swim trunks, a towel, and some coins. She was understandably upset they thought he ran away when he only had change and an outfit to go swimming. I believe it was Gregory Winkle. Hilligiest had also went with him.
I think it was very likely this boy was picked up from the same pool. Most of his victims were abducted from the same area of town, so I doubt it'd be far-fetched to say this. I'm not sure how many swimming spots there were near Houston Heights in the 70s, but I wouldn't think many. Also since he was found with the swim trunks and a pair of corduroy pants, I think he was definitely planning to swim afterward. (Maybe he was picked up on his way there?) When I was a kid, I'd wear my swimsuit under my clothes so when I'd get in the pool I could just take off the pants, and not have to bother changing in and out of my clothes.
Just something I thought about I suppose. This child comes to my mind very often. I can't wait for the day he is finally identified.