Hard to say. We also don't know if that's really the case. Though it can make some sense in context: Many ships probably established the first in class as a "prototype/template" which subsequent ships improved upon in subtle ways, making that first one just a bit clunky and obsolete. Thus, they decided the class would use a later ship as its "lead" vessel. Another possibility is that, somewhere between the drafting, planning, the beginning of production and the final christening, political or social issues might have emerged that prompted a name change. Maybe a major donor to get the project through insisted on doing so only at the "trivial" price of being allowed to name the first ship or two.
Bottom line: Meh; we haven't put that much thought into it.
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