Just because he has the Armed Saber doesn't mean he can use it yet. In the show, Hibiki (and several others) failed the first time he tried to enter Armed Form and temporarily lost his powers. 

Also, If you liked me using a figure to ilistrate his Super Form, then you'll love this;
[img=http://fc00.deviantart.net/fs31/f/2008/227/7/6/Kamen_rider_zolda_Survive_by_Mastvid.jpg]
And yes, his Mirror Beast turns into a tank instead of a motorcycle