Everyone says all the clues point to Partridge, but there are some problems with that.
Why does people say Partridge wanted to be friends with Jane ?
People say look at the dialog.
Well in Season 2 Partridge takes the piss out of Jane by talking about Jane collecting the Psychic scents and he also calls him a jerk.
Also RJ is an excellent marks man, he shoots 3 people in the season 2 finale in very bad lighting, killing one and wounding 2 - Partridge is not weapons trained.
Where would he get all the money for Limos, Hench men and setting people up with a new life ?
Do you really see a small weedy man like Partridge intimidating and brain washing O'laughen ?
Cheers.