Honestly, I think the FR-S happened, and I wouldn't assume that because they've had prototype units around for a couple years that the original prototypes were any good. They might have had failures and had to re-design or something.
I think they didn't start on the Z until fairly late (2011) and then the FR-S came out and they jumped on that bandwagon like so many other companies. They have a full line of FR-S stuff out (or about to be out) already, so they've obviously devoted a ton of resources to gearing up for that.
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