PPP ca be a misleading statistic.
At some firms the difference between the highest paid and lowest paid partner can be a factor of 9 or more. IF PPP is $1M, you might see one partner (big rainmaker) making $3M with a large group making $500k. There are even some firms where the most jr. partners take a pay CUT from the most senior associates for their first few years as partner. Non-equity partners skew this even further.
Finally, the PPP numbers are often manipulated with creative accounting.