Lowman and Blue Bunny vouching for him doesn't quite do it for me. Now if Reazo, Badge or Kels met or knew him, I would take that as the end of the mystery.
Even if he was real, was he a paid shill on the KAA payroll or just a small investor that got taken like the rest of us? He just faded away without admitting being totally wrong in his adamant defense of KAA all those years.