When did it ever come down to the server limiting the monster files? Last i checked:
Server: Hey client, load this monster, this is the number you'll find it at
Client: aight, sec. There we go, loaded from that number.
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Server: Hey client, i just spawned this monster, load number XX.
Client: aight, loading. Wait a sec, there is nothing there. Oh well, the player just cant see it right.