Now that he's got his story right, he is exactly right!
Dupont first figured this out a few years back and came out with their Value shades.
A lot of people laughed at the idea at the time because you would assume a bad hiding red would hide better over a red sealer. Wrong, it turns out it will hide better over the proper darkness of gray better. This has since been proven true with all colors.
No ones laughing now!