For me, I also suspected him of being the genius based on how he acts. He always tries to lead the group attention to the leader and always make sure that everybody follows the leader. And also, it seems that he is the only who is in contact with the leader and talks on the phone, so I wasa suspecting that he was "calling the leader" as an excuse, while in reality he was giving instructions behind the scenes.
Also, as for the leader, when group K and group C first met and the leader talks, it seems like what he said was scripted and rehearsed beforehand. If he was really the genius, that shouldnt be the case.
You're right!?
I mean, right!!
Lol, this is going to be interesting! But im kind of disappointed that Yuuichi hasnt figured it out. Sigh~~.
Eversince i saw K group.. i know that it is always the small one who is the genius.. it's already a cliché tho.. in anime language large body means regular brain.. small body would be a genius brain.. sorry for all the bashers