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kenshin kaden is like a info mation book its not to long and just tells what everyone has ben doing after the last volume it also tells info like in the ruroken profiles book and saito is on another mission and sano is wandering around in china. there is another manga series called yahiko no sakabato its not to long but its about yahiko with the sakabatou and what ends up happening to him in the future and some stuff about kenshin's and kaoru's son kenji

So the yahiko no sakabato isn't included in the vol. 1-28 manga series or in the kaden?

Yahiko no Sakabato is in the Shonen Jump. (I have it)

In the Kenshin Kaden there is a short thing (it's only... *counts* 6 pages) called Haru Ni Sakura about them reunited.

There is a scanslation at the awesome the-oro.com here:
]http://the-oro.com/kk_lay.php?x=multi/kaden