Doing extra combos is not a mistake in the objective sense. It's just extra - worth nothing. CoP is simply bad and penalizes it rather than ignoring it.
Brian consistently leaves out combinations. I see that as a bigger mistake than doing extra.
P.S. - Dai was only "far enough back" in the SP at 2007 Worlds because of, yet again, bad CoP rules. His SP was beautiful and he should have won that World Championships after the LP, not Joubert.
We've had this discussion before, I believe... But here goes, most of it OT: figure skaters have rules to play by, namely the judging system. Disregarding those rules, even unintentionally, has consequences. Doing extra combinations is a mistake in that it is unplanned and offers no strategic benefits to a skater. On the other hand, occasionally watering down a program does make sense strategically, as it did for Joubert in 2007 but not in 2008 or 2009 (it wasn't that watered down, BTW: with a quad to start and all his combos after the halfway point, Brian still scored over 157, and over 240 overall).
It's only a mistake if the tactics don't work; otherwise, it's neither here nor there - maybe a let down for some of those watching, but not a stupid mistake like a Zayak violation, which after five full years under CoP, nobody should be making.
I fail to see how the system left Dai far behind after the SP at 2007 Worlds. Dai chose to do a 3-3 rather than a 4-3 (bad tactics, since he can do quads) and then URd the 3T. You can't blame that on the system. I agree URs can be overly penalized because of the lower base value and low GOEs, but Takahashi's GOEs weren't
that bad. He also didn't max his spin levels, while Joubert did. Dai dug himself too deep a hole and paid the price by missing out on 1st place. "Beautiful" is subjective, but technically Joubert did more in the SP and could afford to play it safe the next day (mind you, he was still recovering from an injury, so that year he and JCS probably made the right call).
I think, BTW, that both guys can be headcases, but then again, most of the guys aren't exactly models of consistency these days.
ETA:
Seniorita, here's Alban's
Bee SP. Plushy's arm movements would indicate a bigger threat, perhaps hornets?
