For all you guys know, this could still be Tanaka's roadmap. Yoshida might just be tweaking it here and there, and changing the priorities around.

Or better yet, perhaps Tanaka is working "behind the scenes" and Yoshida is here just to make people smile. ;D

OR... OOOOOR.... Perhaps Yoshida and Tanaka are girlfriend and boyfriend. ;D (okay, that might be going too far in the conspiracy)