That is not the major takeaway from that analysis. In fact, I would say that the data supports the opposite conclusion. With thorns necromancer being an exception, classes that perform best at the top end also perform better throughout the entire leaderboard.
Also, Pro’s analysis presented for patch 2.6.6/era 11 shows that the weakest class below GR 120 or so are necromancers (gray line) and more broadly across higher clears monks (red line) .
I have performed a more comprehensive analysis of era 11 using the final data from that era . My results and Pro’s are largely consistent.
This analysis also includes a peek at the era 12 data.
What do you mean by average clear here and average clear for whom?