[vin13ish]

A great episode.

Could Kamen Rider Proto-Drive's identity is Chase?

That's irony because Chase is Kirhiko Sudoku of Drive as both of them are rival to Main Rider while Proto-Drive is Skull of Drive as both of them are mysterious rider who was killed in episode 1 and we learn more of them in later episodes.

Chase/Proto-Drive is like combination of Kirhiko Sudo and Sokicki Narumi/Skull

Dang! That blew my mind!