Hmmm, I legit forgot about this this guy. I'm guessing he's either in hiding from debt collectors or he's sleeping with the fishes.
There is no substantial evidence to support him working at Compile Heart.
Also, what you're talking about isn't disappearing. If said person disappeared, you wouldn't know they took over an udon shop.
Isnt Mikage at Compile Heart? He was in the Trillion Destroyer Promotion Video right?
Also disappearing doesn't have to have sinister implications.
I remember hearing the director (or art directo) of Shadow Hearts (or was it Lufia) went home to take over the family Udom shop after the company folded.
There is no substantial evidence to support him working at Compile Heart.
Also, what you're talking about isn't disappearing. If said person disappeared, you wouldn't know they took over an udon shop.