My mind has been blown by this... An anonymous source once interviewed Gosho Aoyama and he said the boss of the Black Organization is indeed in the "Night Baron Murder Case" (Episodes 68-70 in ENG sub). So...it's possible that Genichirou Kaneshiro is the Boss. Now, after knowing the Boss' true identity from Volume 95 File 1008, Genichirou Kaneshiro may likely be the Boss that is in disguise for the Episodes 68-70.
However, I don't believe that Shizue Hayashi is Vermouth in disguise, instead, I think it's Hideko Kamijo. She has a very similar physical resemblance and even the same voice actress (maybe?) with Vermouth.