If the pilot had become incapacitated to the point of being unresponsive and had the a/c been flown by a passenger he/she must have been at least a high-hours PPL or someone with a lot of sim/game experience as the a/c joined the cct in a classic manner. Joining procedure isn't something a non-pilot would know. Even a very experienced and able piston/single PPL might have ended up where this a/c did.