just wondering. maybe the conan doing the deduction is ai in child form and the big sherry running around is someone else (maybe shinichi himself but i kind of doubt it). also, the mouri is pretty weird that i'm thinking he's someone else in disguise. remember they said before they boarded the train that mouri was missing. maybe someone replaced him and disguised as mouri. my deduction from the fake is mouri might be hattori.
but these are just all speculations. i have no solid proof about them. just some thought i wanted to share.