My understanding is that even in Canon, Anakin, Yoda and Sidious all share these various "unparalleled" accolades. That more or less supports the Lucas/Gillard ranking of them all as level nines.
Also, while Anakin's overpowering of Dooku is a clear showcase that he's a level nine, the SW website claims that the Count wasn't prepared for Anakin's sudden amp. If he had been, we can assume that the fight would look more like Tyranus' fight with Yoda in AotC.
The quote can still apply to darkside Anakin. Jedi Anakin still had darkside tendencies and any duel with him runs the risk of him tapping into these emotions:
For what it's worth, Gillard actually says that this runs in the entire lineage IIRC, but he also makes a point that Anakin is the only one who lacks the mentality to control it (as opposed to Obi-Wan).
@shroudofsorrow: They most certainly did lighten up after the Battle, but yeah they were badly damaged and short on supplies anyway, so there was no chance for them to do it.
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