6.0 skaters did what they had to do to succeed in that period; we can't say for sure how they would have fared under the IJS (early or current version). We've seen skaters make the transition with varying levels of success: Takahashi and Kostner started out in the old system, but their skating works well with the current one, while Joubert made some adjustments and has been quite successful, but probably would have done better under the old system. KvdP remained a 6.0 skater at heart, as did Johnny Weir. Kwan I wouldn't count, since she only skated once under the IJS.
I think Plushenko, like Joubert, has taken a mixed approach, making some adjustments but retaining the core of what he was as a 6.0 skater. It's worked well for him, obviously.
I hope his recovery will go well. At least winter in Israel should be much nicer than in Russia

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