Sharp as ever Brownie . I actually missed the Weinstock connection.
But to the three you mention, let me add that both are Pestige dates, and that both have liner notes by Ira Gitler. So, 5 points of similarity (so far).
In addition, they were recorded within about 8 months of each other, the Melle in August 1956, and the McLean in Feb. 1957.
plus, both Mellé and McLean start with the letter M
both from the "M" section, I presume.
Never underestimate the obvious dear Watson!