Ever since Lu, who usurped the now-gone Mrs. Alfred Packer, the hippywife primitive, as denizen of the cooking and baking forum, the sparkling old dude's hardly ever been there, probably discomfitted that the forum isn't so full of Hate and rage and spite and envy and Godphobia and pretension as it was when Mrs. Alfred Packer wielded the rolling-pin (and hippyhubby Wild Bill the cadaver-carver).
Lu's a nice person, and I don't think she chased the sparkling old dude and Sherlock Judy away; I think it was just one of these natural evolutions where one just drifts away to somewhere else. But in these two cases, both drifted away because Lu's serene niceness is too much for them to bear.
Now the sparkling old dude spends much of his time in the pets forum, and Sherlock Judy, if she hasn't already been, is fated to fall into the Dungeon, the conspiracy forum.