Hi, thanks for the help. And sorry for the late reply.
Normally the wiki is about "Basilisk", which is adaptation of the Kouga Scrolls, the Futaro Yamada x Masaki Segawa version as there are other Kouga adaptations too. I would love if we include a lot more of Ninpocho series by Yamada, but I believe it will go too big and we won't be able to handle it.
In case of expansion, I think it will be more reasonable to focus on Futaro Yamada x Masaki Segawa versions. And since Yagyu Scrolls can be viewed as sequel to Kouga Scrolls, I think its possible that we include it. Yagyu also has sequels, but like I said, to not get too big that we won't be able to handle, we should cover them only if they are based on Masaki Segawa version, otherwise we can just mention them.