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We can Assume around 10000 sMerits montly for legendary rank are from legendary sources.
From here if Legendary ranks has 47k sMerit sent overall we can assume 90% of this are from sources.
This influence a lot the data for this rank.
Perhaps, if the assumptions are right, the Legendary Rank Data would be different from what we see on the top OP. Nevertheless, I do not know (nor wish to know really) who the 80 Merit Sources are and thus cannot substract them. I published the individual data in the link provided today, so if anyone feels that the know the sources and want to give it a go they can...