And Kirk Sh. would now say, "not CCS, but Stored energy,,recombination, hydrogen release etc.." But these early critical suggestions in 1989 was evaluated and calculated and there is no such possible explanations.
You are assuming hydras have only one head. I'd be very very surprised if Kirk does this and unless he does what you have here is a pernicious straw man.
CCS can be a real systematic error (for total heat excess and power bursts)
Stored energy can be a real systematic error (for power bursts)
There is no exclusive or here, as you imply.