Since the start of the 2006-2007 season Yu Na Kim has lost exactly 6 times in 6 seasons of skating (taking off the 2011-2012). That is very dominant, and more dominant than Michelle Kwan ever was. By contrast from 1995-1996 to 2002-2003 Kwan had 8 seasons of skating, I am being kind and chopping off all her non prime years, and lost 16 times total, so an average of twice per season vs Kim's average of only 1 time per season in all her senior seasons. Kim has won 3 of the 7 World or Olympic events she was in, while Kwan has won 5 of the 14 she has been in, but we can drop 2 of those and it is still 5 to 12 which is still only about the same ratio. Kim though also won 3 of the 4 Grand Prix finals she was in, vs 1 of 5 for Michelle. So if Kim somewhat "wasnt dominant", I guess by the same standard Kwan was never dominant, even under 6.0.
In truth one could easily suggest Kwan was ever dominant was the 1995-1996 season and 2002-2003 season (where she did like 3 events including a cheesefest), but she didnt even test herself on the grand prix in the fall 2002 series where she might have had trouble with Cohen who was peaking then before falling off at Nationals and Worlds. Atleast Kim was unquestionably dominant for 2 straight whole seasons while competing regularly in 2008-2009 and 2009-2010. Kwan lost 4 of 5 times she met Tara in 97-98, then had a year she barely competed until showing up and losing Worlds to Maria, then usually lost to Slutskaya from 2000-2002, then had that 2002-2003 season she barely competed but since she handily won Nationals and Worlds I guess you could say she was dominant, then began to decline out of the top the years after. Kim already began dominating in 2007 and 2008, and especialy dominated the 2007-2008 season until Worlds. She set a WR short program and long program score, which nobody would break until she herself did, she won the Grand Prix final both years, she won most of her meetings with Asada, Ando, and everyone else. She just choked in the LP at the 2007 Worlds after beating both Asada and Ando to win her second grand prix event, beating both handily again at the Grand Prix final, and easily winning the short program with a new WR at Worlds; and at the 2008 Worlds had been the heavy favorite to win after owning the 2007-2008 season to that point but entered Worlds with a bad back injury unfortunately.
Kim's dominance over the field at the 2009 Worlds, 2010 Olympics, and 2013 Worlds was never displayed by Kwan anywhere ever, other than maybe the 1998 Worlds, and even there Slutskaya beat her on technical marks in the long program.