I think it's hard to tell where Miami belongs. Miami seems to belong in Tier 2 if you look at the number of buildings 500-599, as it is clearly distinct from those below it on that measure. But Miami is way behind Toronto and Chicago in terms of taller buildings. It looks like a city caught in between.
IMHO, the most important and least noisy measure is the number of buildings 500-599.
Using pure counts of buildings in each height tier, the transition from Tier 2 to Tier 3 is subtle and hard to include or exclude Miami.
Using the sum of height for all buildings 500+, Miami falls behind.
Using the point system used earlier in this thread, Miami definitely falls behind Toronto:
But here's the problem. If we exclude the Big Three, Miami is clearly still an outlier looking at the cumulative height of all 500-599 buildings:
And Miami only looks like the others if you use the point system to give a lot more credit to supertalls: