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This idea of the post-Decade Riders following a pattern of having design elements paying homage to old non-Rider Ishinomori Heroes really unheard of? It's more than a coincidence.
You never stop to think why certain Riders are designed that way?
I don't have a "100 secrets of Kamen Riders" type of books saying it is so, but to a point it is something they are doing intentionally.
Like I said it is very loose, only at this level. Some I have not confirmed (well as much as I could)