Just a note: the single rider line at Raging Spirits can take a very long time. As people do tend to pair up for this ride, it's hard to get groups that will have space for a single rider. (And depending on your operator, they may ask groups if they mind having a single rider join them, and they don't always want to.) I've waited 40 minutes in the single rider line for that one, and honestly I don't think it's worth it.
Indy, meanwhile, is the best single rider line around. Usually can walk through the queue and ride in under ten minutes.