Ok, I think you're misunderstanding.
If a party consisting of levels 4, 5, 5, 6 (average party level 5) should fight a CR5 monster then each of them gets 1000/4 (I'm not sure what a CR5 monster would give to a APL 5, just using 1000 as an example).
If you do it as per the FRCS, then the level...