I still remember this Kamen Rider Black and Black RX. In PHL, they call this Masked Rider Black and Black RX. When i was young, I used to watch them. Many years later, when I finally got cable, I was hell surprised Kamen Rider had already changed and many Riders had been shown !!! The time I got cable to watch Kamen Rider was Kamen Rider Kabuto, probably as much bad-ass as Kamen Rider Black and Black RX. !!!
RX was my favorite of all time and my first Rider. It was fate that I was in Japan when the episode of Decade with him in it broadcast. It was like watching a childhood hero show you he still has it! I turned into a child all over again and if it wasn't so awesome I would have cried. This song is the perfect feeling I have about this.
Even then Decade's Black and RX are different from the original Nogami who is both Black and RX. Since this was when Kamen Rider continuity made sense. Now i wanna see all the Tommy's go into ranger form and fight someone alongside Decade.
If I recall correctly, they created an alternate universe in the KR Decade show where Minami Kōtarō never became RX, and then DiEnd used the Black Kamen Ride Card that Decade had to summon the Minami Kōtarō from that universe where he and the canon Minami Kōtarō could fight together.