From the last entry... because
sencha_kt would like to see the genius 10 boys travel by train due to Shuu-san's dislike of the airplane...
Disclaimer: I do not own PoT, original pictures taken from mangareader.net...
1 Month before the foreign Expedition Campaign begins...
...
AND THUS
...
...if you said so, Shuu-san :)
Personally I still think it's just an excuse. The reason Shuu-san stayed on camp is rather to train the lower courts up... Although we never seen him playing with anyone else than Tokugawa ^^;