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tyrannos - the fossil record is still pretty scarce, no?

In general, how many T.rex, "nano", Daspleto's etc. would be needed to get a good feel on what the experts really need to make a positive distinction on species and anatomy?
Or is it just getting one really complete skeleton of a baby, juvenile, and adult for these guys?
The big more-or-less complete Rex female recently found sort of covers the ground for the adult female Rex, but you need one of the same quality for a male, no?