To verify the question 1:
Because of the the theme of the carnival; a warped rhapsody for the puppet
or カーニバルの主題による人形のためのいびつな狂想曲 is that song yes.
He collabed with RevenG to make Vaiconia and with Ryu* to make hora de verdad. Which would mean RevenG made two of the cybers
and so far; no song has been credited as Wac. As far as i know. They mention a Wac credit in the Tangerline remix.
This article also marks that Wac organized the GiraGira Megane Group (pop'n ron/Ryoran hit Charts folks).