The difference is we didn't put an S sound where there shouldn't have been one.
you'll notice the Zs at the end. This could well be intended to make a double consonant sound, much like Fhtagn, which actually makes two moments of a double consonant sound.
So where Locky inserted an S prior to the M, where clearly there was not, it could be feasible Jim here intended the double consonant sound with the Zs ending his name.
Of course Locky may have meant 'Jes Mis' and it's first S to be silent, so perhaps it is NO ONE came up with an extra and non existant S sound.
So, in short, PISS OFF!![]()