There isn't even a question if those players are able to execute a pefect rotation at that level. What seperates them is what I call smart play, and that includes a myriad of little things, things most players don't even think about and those things have nothing to do with dps output. It's about staying alive, keeping others alive and improvising on the spot.
I raided #5-#10 25 world for years and what held us back from ranking higher was not time invested or anything like that it was players who would rank great but had no clue or ability to bring anything else to the table, didn't adapt to unforseen events in a bossfight, forgot about half their abilities which had nothing to to with numbers and made wrong decisions when Plan A failed. Really smart players a VERY hard to find, and this is what Paragon i.e. always seperated from most other guilds. They had and have those in abundance, people who react right in crucial situations, see the whole picture of a fight, people who understand all parts of the fight in detail and not just their 5 button rotation.
Those people interestingly tend to be not interested at all in WoL ranks.