It was mentioned in an article that announced who they got to voice the Driver if I remember correctly.

There might be chance of Third Rider of Drive because Mashin Chaser's suit actor is Yasuko Imai, NOT Eitoku who have play all Secondary rider of Neo-Heisei (Except Beast).

Eitoku might be suit actor for Third Rider

That's a pretty sketchy inference to make. Save this thread for actual rumors and speculations, not just assumptions.

Then it looks like I'll have to make a thread on assumptions about Drive.

I'm just saying that making a connection like that and inferring based on something like that the show will have 3 riders is stretching it. This thread should be about discussion of what we actually know or have seen. Yes there's the rumor element, but right now the extra riders thing isn't even a rumor. Much like the current sentai rumors which are nothing more than the usual let's make up what we feel like before the trademark is registered stuff we always get.

Not to mention that the show JUST freaking started of course they'll add more Riders later on, but it's way early to making baseless assumptions like that.

Mashin Chaser isn't a Rider.

I agree that Eitoku will probably play the secondary Rider of Drive, and I still believe Mashin Chaser will eventually become something of a Rider possibly later in the series leading to probably 3 riders.

If Machin Chaser ever becomes a Rider, I hope it's like a Shin Zangetsu sort of thing, where it's a very similar suit but with a ton of new detail and he can switch back to his old form.

2nd Kamen Rider. '' Kamen Rider Mach(仮面ライダーマッハ）''
Henshin Belt is '' Mach Driver Fire (マッハドライバー炎）''
http://i.imgur.com/ybMGOTp.jpg

He vehicle ''RideCrosser(ライドクロッサー）''
''Kamen Rider Drive Type Deadheat（仮面ライダードライブ　タイプデッドヒート）
''Kamen Rider Deadheat Mach （仮面ライダーデッドヒートマッハ）
http://i.imgur.com/dbjwpFK.jpg