OK.
to release that kind of a/c with one main wheel gone : NEVER.
torx, to put a question such - how one wheel can be missing ,,,is a kind of out of my judgement at that time. i hope everybody understand. (not too open manner... hmmm)
if the subject is carried in a more open manner like you suggest then i should blame the maintenance straight away. .

why it was missing? the manual doesn't provide enough guide? or the manual also got missing somewhere......phew..or maybe human factors got to do with it.
you are free to lock this thread.