The 493 can be deadly slow especially during peak hours when it hits Barnes and East Sheen, I wonder if the Superloop could follow the 493 from Richmond to Putney Heath but then take the same route as the 93 via Wimbledon from Tibbet's Corner onwards? My guess for a route for would be Richmond Station, Roehampton, Putney Heath, Wimbledon Village and Wimbledon Bus Station.
That would seem to be most likely route. But would it go from Roehampton via the Green Man at the top of Putney Hill to Tibbet's Corner, or along to the A3 and directly there? The South Circular can indeed get clogged badly, so for that part of the route the SL won't be much faster than the 493, even with a small number of stops, say at The Bull at East Sheen and at the north end of Roehampton Avenue (what used to be the Red Rover).
The Richmond to Wimbledon Superloop service sounds like a faster 493 and Ealing Broadway to Kingston sounds like a faster 65.
That's what it seems to be. The 65 is a reasonably quick route, albeit slowed down by the constant 20mph limit, at least from Kingston to Richmond, but it can get horribly clogged at Kew Bridge through Brentford up to the Great West Road. Either way, the SL won't be much faster than the 65, again even with a small number of stops, say at Ham, Richmond, Victoria Gate (Kew Gardens), Kew Bridge, Brentford, South Ealing.