So they acted exactly as all of their contemporaries? You are importing an anachronistic modern standard and thinking this matters. History writing was a literary genre, using tropos and themes to make a point, not the brute recording of facts that we pretend it was today.
Look at Plutarch's Parallel Lives for a good example. History was written to inculcate virtue, to learn a lesson. To emulate or avoid the examples of the past. Historians placed material in the best manner to make their point. Modern Historical Criticism is its own thing entirely, and we do exactly the same: We rearrange and debate the details provided by the Ancients and put it in our own framework of what we think 'really happened', creating our own artificial timeline based on rigid criteria of what we moderns think more plausible. Robbing Peter to pay Paul, or playing off the supposed reliability of ancient writers against each other.
So no, it matters not one iota that they maybe prefered a number for aesthetic or dialectical reasons. It doesn't change the point of their narrative, and only really matters if you are writing a modern history on it. Even then, you'd just state what the various sources said, whose number you prefer and why, but the validity of those accounts aren't thrown in question here - for all those numbers remain plausible, you just need to choose between them. No one said something ludicrous like 3000 bishops or the like, after all.