Originally Posted by kakuwhite18

After watching the scene you linked to, here's what I got.

The Ohranger seem to know of the Kakuranger and the battle against the Youkai. I do gather this is their first meeting, and it seems like the Kakuranger and Youkai War is common knowledge.

While I can't be sure, it seems Sasuke and Tsuruhime were investigating on their own, while the other three may have been following leads about an MOTW somewhere else, with an agreement to meet up together at a later point.