The THV pool is pretty small but it doesn't need to be any bigger as nobody uses it.
We were in villa 7004, almost as far from SSR as we could get and it was a 10 minute walk, at most, to the Grandstand section.
You could take a bus from THV to the Springs section at SSR where the main pool is. The bus only runs every 20 minutes and the bus ride itself is as long as the walk. We tested it; I rode the bus and my husband walked. We arrived at the Springs at almost exactly the same time.