Well, for my current Schwarzbier/Black ale experiment, I pitched the London ale yeast while aerating and the lager yeast before. The only problem I see in the timing is if you are sprinkling a dry yeast directly. If you aerate first, the yeast might get hung up on the foam.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk