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!

You're making my head hurt.

Watched last night. It was short, sweet, and now I get to use the best line ever created. "I don't need to introduce myself to something I'm going to destroy".

If they had used that as the tag line in Decade it would have imploded the fandom. If Micchy or Kaito had used that line, it would have made them even more badass. Let's face it, as far as Rider taglines go, that's pretty black.

The episode also ties in very nicely with episode 10, without giving too much away. It's nice to have it as a prologue.

I know right? :P

He wins on the catchphrase, certainly.

His voice seems to obvious as to the identity though, I'm kind of suspecting something more complex now.

Seconded.