"Who told you?" is a signal that someone has identified a scandalous WELS event, a warning to forget it, as the creatures forgot the Piper at the Gates of Dawn in The Wind in the Willows.
I drove by a town in Arizona where a former WELS member lives. He was in business so he saw through the Church Growth marketing of WELS.
He said one day, "The big Church Growth pastor's hand-picked successor left the ministry due to depression."
I said, "Really? What was her name?"
He shot back, "Who told you?"
I replied, "When a WELS pastor leaves the ministry suddenly over depression, a woman is involved. Just be glad it's a woman."
Lenski explained it a long time ago. He was a genius in New Testament exegesis but also a District President. That was when a DP could have an IQ bigger than his belt size. Lenski said, based on his experience, that a man who was unfaithful to the Word was also unfaithful in other areas of life.