3 main reasons PARTRIDGE is RJ

1.faked his death to avoid attention.

2.has a feminish voice similar to the voice when he appeared in the mask and his voices over the phone.

3.is a forensics expert !and he is smart enough not to be a bait on janes tricks!!and all the political power because he is bret style's son

I expect a smart ass saying heller said "partridge is dead" what if he meant by that he is dead
as partridge but alive as RJ you don't know how the writers think everthing is possible 

ok thats a hunch