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Probably unpossible for anybody to ever play RF as well as Ichiro played it, when you factor technique in. But Heyward would be the best try.
That's a good observation: the Figgins Factor (soft-skills 5 WAR) could manifest themselves differently: rather than a Fast & Furious car explosion in year 1, you would have to sweat the age-arc. Agreed. But fast-player skills do age better than old-player skills, so ...
The opt-out seems to be discussed a lot on the 'net re: Heyward. Typically the player has all the control there: the contract is 9 years if the player wants it to be 9 years.