Hence Tornado survived since it had an enduring capability in AFG and Harrier did not.
Quite, and the point is that Lord West et al need to recall from their briefings when they bottled said decisions is that if the GR4s had been binned, it's not as if JFH would have been spending their time on a CVS anyway - as they'd have been (almost continuously) in Afghanistan.
How much deck time outside of Joint Warrior / JMCs have JFH had over the last five years? Not so much, IIRC.
Bottom line: would it have been nice to have retained both JFH and GR4? Of course - but that's not the world we live in, and I'd have kept MRA4 over JFH every day and twice on Sundays. (In fact, I'd probably have cut more GR4s to retain Nimrod, but that's a different argument.)
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