I don't know if the SF2 was widely marketed at the time the JJ was decided on (~6yrs ago)Yes a SF2 is only a closed SF1 which itself is a RB80 clone
It would have seen as a natural choice.
Maybe the carbon construction, maybe more personal link with JJ and AP?
Anyway, they made a choice and it is their and they look happy with that
I'm not really an SF2 fan so I think they made a better choice with the JJ