Looking back in skating history there are many pairs and dance teams who were considered always unbeatable if they went clean, especialy dance. However are there any women and men who were unbeatable their whole careers if they went clean. I mean excluding the early years of their careers before the matured, and talking about only from the 1980s until today. Here are some possible candidates for that and which ones I would pick as yes or no:
Michelle Kwan- I would say no. She lost the 98 Olympics to Lipinski even skating cleanly, many thought she should have lost the 96 Worlds to Chen despite skating cleanly, she could have potentially lost anytime to Slutskaya (and perhaps at times Butyrskaya) from 2000-2002 even skating cleanly, and she could have potentially lost anytime to Cohen even skating cleanly from 2003-2005, and to many skaters in the final season or two of her career.
Yu Na Kim- I would say yes. I dont think there is any event from her senior debut in fall 2006 until today she would have lost skating cleanly. Some might argue there are periods a clean Mao would have had a chance vs a clean Kim like the 2006-2007 season, maybe even the 2007-2008 season, and maybe now, but that is moot since Mao never skates cleanly anyway. Besides the scoring evidence suggests Kim would probably have the edge all those periods even had both gone clean anyway.
Alexei Yagudin- I would say no. I have seen him skate perfectly or nearly perfectly and still lose to Plushenko. At the 2001 Grand Prix final his only mistake was putting a foot slightly down on the 2nd quad and he still lost handily. Even had he done had that slight error he probably still loses. In the short program he skated cleanly many times and lost to Plushenko, so that probably would have carried to the long a few of those times too.
Evgeny Plushenko- Again the answer is no. Just as Yagudin always had a chance even vs a clean Plushenko, a clean Yagudin always had a chance even vs a clean Plushenko. Plushenko skated perfectly and still lost the 2001-2002 Grand Prix final to Yagudin who had some mistakes.
Midori Ito- I would say yes. The only ones who might have had a shot vs a clean Ito are Yamaguchi with all of the triple lutz-triple toe, 2nd triple lutz, and a clean triple salchow to give her 7 triples (would still lose tech. to Ito but might win it on the 2nd mark) or Harding with one of her stellar 91 performances with the triple axel. However Harding only delivered that level of performance twice and both were in competitions in the U.S which Ito was never going to be at, and Yamaguchi only delivered this twice and both in competitions in the U.S Ito was never going to be at.
Mao Asada- I would say no. Even skating cleanly she was always losing to Kim also skating cleanly anytime from fall 2008 until her new jump layout and a bunch of rule changes starting in winter 2013 at the very least. She skated some cleanish performances and even lost to Ando several times in the 2010-2011 season.
Elvis Stojko- I would say no. Urmanov or Kulik skating cleanly with a quad could beat Stojko skating cleanly even with a quad-triple even in his prime years.
Any other candidates you can think of that might be unbeatable their whole careers (minus the early part) skating cleanly.