From its contribution on this forum, basically "rankable" users are determined its merit numbers regardless the actual rank or its activity. Some of them doesn't care their merits numbers, only their contributions, and most of these users don't wear paid signatures.

Here is the updated DT members since new DT system was implemented https://bitcointalk.org/index.php?topic=5117330.msg51424908#msg51424908

Or they are totally visible on BPIP or on LoyceV thread list https://loyce.club/trust/ranking/