In 1931 there was a wealthy man living in Menlove Gardens...
His name was Parry. He was almost certainly the wealthiest Parry in Liverpool. When he died in 1940, he left the modern equivalent of £4 million.
Wealthy enough to perhaps attract the curiosity of his ne'er-do-well namesake, who perhaps went to gaze at his nice house, and noticed that the address where he lived was an odd 'triangular affair'....?
It's an interesting story but something thst holds low evidential value. I mean, in complex cases such as this coincidences abound, particularly if you look hard enough.
Thus, I know you reject any involvement by Wallace, so what of Lily Hall's evidence? For instance, I seriously doubt that she lied to the extent of giving evidence under oath anf under cross examination, particularly as she may have been implicating an innocent man.
But if she was mistaken that means, despite Wallace's distinctive appearance, she must have observed a Wallace lookalike, who just happened to be in more or less the exact place, at the exact time, you would have expected Wallace to be on his return home from the fruitless Qualtrough appointment.