This show requires an invitation.
He probably was not invited.
They used him in the early advertisements, which is a shit move if they had no intention of him (Rhoden) competing. (I think they have since removed his image).
People thought he was going to be in it, but maybe he backed out and they just surmised that he was going to do it? (Not sure).
Rodan's best days may be behind him as he was just peaking with the "O" win, then maybe could have followed it up and maybe with the Arnold won more money and sponsors.
I don't think he has much going for him these days. (Sponsor wise).
The bank-robber (as Aceto calls her) really put a damper on his career. Or he did, if he really forced himself on her. Only those 2 know what really happened.