Huh... Tobei Tachibana, the mentor character who appeared from the original series up to Stronger has been recast and will appear in SHTGP Kamen Rider 3. He'll be played by Rakkyo Ide, but his appearance here actually is heavily based on Ishinomori's design for the manga, where he was an old butler working for Hongo's family, complete with baldness, thick eyebrows and a mustache, rather than based on his original actor, Akiji Kobayashi. There's a scan with a picture confirming that information and showing his face, although I can't post it here due to NeoGaf's policy regarding scans.
I guess it's a way to show an older Tachibana while avoiding direct comparisons with his original actor. Previously, it had been shown that Rider 3's TriCyclone has emblems of the Tachibana Racing Club, so I guess this might actually be a plot point now.