I don't know how RJ is...i want to tell my thought about RK...first of all i was thinking of the part where he ask the other guy do you know me and etc....well the other guy told lorelai that he choosed women for RJ...so how about this:
he picked a woman related to RK...and RK took or viseted that woman to that celter he used to pick up women for RJ...so he have seen him again in the past and maybe he has seen RJ..but i don't think so because if he knew who he was and had seen him he would already took his revenge, but i believe RJ has seen him..so i continue..maybe that is why he asked that guy if he knew him...to see if RJ is able to recognize him in case he gets to him...and he kills him any way so that PJ don't get closer to RJ than he is...about that friend think i believe that is ironic he just wants him dead and make it look like it was of natural causes..somethink i wanted to add on this part is that...who wants a painfull death??? and why does it have to be close friend if i had a choise i just wanted to be quik and painless...even if that ment that i would be killed by satan him self..just my though..waiting for answers :)