Carl . . .
At the risk of beating a dead horse (not to mention hijacking Wayne's thread), I think you're both assuming facts not in evidence and confusing/conflating the terms 'size,' 'length' and 'finish.' So please -- double check your definitions.
No. Presuppose nothing. Length and finish are neither directly nor indirectly proportional; both have a genetic component; both can be effected by the conditions in which the koi is grown, positively and negatively; in any case, neither is knowable with certitude.
No. Presume nothing. All of these koi can and should be 'finished' for show purposes relatively soon -- long before their maximum length is attained, whatever that length might turn out to be.
Again, there is no relationship between length and finish. Some koi finish early, some finish late and some never finish at all. On the other hand, koi are indeterminate growers; under advantageous conditions growth can continue long after finish has come and gone.
For me, yes. Typical female conformation should surpass that of a typical male regardless of their respective lengths at maturity.
And for a good example of "it all depends," see JR's post on this thread's incarnation over on Koishack.