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Ive just checked it on the Merit Dashboard and @Quickseller (as of last Friday) had earned 552 non-airdropped Merits, while having sent 488 sMerits. The 552 earned merits would account for 276 sent sMerits out of the 488 sent sMerits. The remaining 212 sent sMerits could be part of the initial sMerit airdrop (or not):
Since Legendries could have received up to 400 sMerits depending on their activity (see
re:Initial sMerit for every rank?), those 212 sent sMerits may have come from the initial sMerit airdrop, from being a Merit Source, or a combination of both. Just by looking at the numbers I dont think we can determine that he is a Merit Source yet.
You can assert that someone is a Merit Source of the total amount or sent sMerits > (Received floor(sMerits/2) + Max potential airdropped sMerit for the rank), but just before this value there is a grey area due to not knowing the exact amount of airdropped sMerits.
Many appointed Merit Sources tend to have small allowances to start-off with. They also are often people that earn merits (thus generating sMerits), so during the first months, the awarded sMerits from the Merit Source allocation may not exceed the generated/unspent sMerits, and thus remain undetected (as is the case of @Coolcryptovator I presume).
I believe that the maximum that any Legendaries could have received on the initial airdrop would have been 200, so Quickseller has spent an excess of 12 merits which would explain why he has been detected as a merit source.
By the way,
it does appear that as of last week, theymos added an additional 7 merit sources (raising the total merit sources from 123 to 130)
Edit: I take back everything that I said above, and I suppose that my memory is going bad because it seems that I had erroneously recalled that my initial airdrop of smerits was 200.