The dropped out merit source is
QuestionAuthority and he is the number 2 in the list of meriter user rankings with 3225 awarded
3225 in around 8*4=32 is equal at around 100 sMerits weekly.
This is not a very big number on the paragon with the past weekly sMerit and the 1 "month ago week merit".
In addition, a large Merit Sources seems to have dropped out (and he/she looked like a 1K monthly Merit Source), so that could create a small dent.
Was way lower than 1k/month as the previous quote he spent an average of 400/month 100/week.
3225: QuestionAuthority