Everyone is theoretically the best in their own minds. Reality tends to have different opinions on the matter.

Target dummy rotations tend to diverge from what happens in practice because fights don't work like that. You lose uptime. The boss goes untargetable. Sustained dps invariably loses out to burst. This is where WAR, with a 10 second dummy-proof burst window which accounts for most of their dps, tends to pull ahead. That's also why the gap is largest at lower skill levels and narrows to a slightly more reasonable difference at higher skill levels.