Again, Kwan was clearly in decline by 2005 Worlds, not close to her physical best while Irina skated the most technically demanding skate of her career. Not only that, but didn't the 2006 OGM place 9th in those Worlds? One competition doesn't really prove anything. It's just unfortunate that Kwan never competed COP before or after those Worlds. She still managed to place third in the SP and LP despite having arguably the worst Worlds performance of her career there and level one elements she could have altered with more experience. At least 1997 had a great LP and 1999 had her doing 6 triples in the LP.Yeah as the 2005 Worlds showed.
I think the 2008-2010 COP is a lot more friendly to Kwan's style of skating than the 2005-2007 was. That said, I don't think Kwan would've been able to match the GOE from Slute's jumps which I think is where Yu Na gets most of her cushion.