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not following you with "the array" ..? :S
im on PS3.. Are you talkin PC stuff?
An array is basically an indexed set of like data types. Each player in the game being represented most likely by a variable of data type string (eg, their name), which would be associated with a set of stats and a character model stored somewhere else. When the game needs the player(s), either something like a random number generator picks a set to be introduced into the ML, or maybe some kind of algorithm does the choosing. If the latter were the case, it would be extremely interesting (to me, anyway).
You can probably find the tools to edit PS3 games hiding somewhere in the Internet (I think Sony sublicenses them as a developer's kit), but I'd advise against it.