The amount of krausen is a measure of how fast a fermentation is starting and the yeast are working on the easy stuff. It's not really any indication of potential ABV.
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