He's still very fit to remain a merit source, I looked up his profile and I found he was last active July 19th this year and considering the time span from there till now it's not even up to a month (it's a little common with some members) chances have it that he never knew he was a source.
Note: I haven't read the rest of this thread yet, so there may have been a response clarifying Irfan_pak10's activity and/or whether he and the other two members know they're merit sources.
Being a merit source and not being around for a month is kind of giving the community a kick in the ass, especially if there aren't many sources relative to how big the local board is (and I don't the numbers regarding the Pakistani board). My opinion is that if you took on the "job" of merit source, you really should be spreading out those merits far and wide
Sure, some sources have been at it for years (like me) and have suffered some burnout, but that's ostensibly why Theymos added some more sources recently. And with that.....I'm going to read the rest of this thread, because the merit system is near and dear to my heart.