Huh, yeast cakes... Look at that in your clear jar... As it stratifies, or creates layers.... Which layer do you think is the live yeast and dead yeast? From all I read, the top white creamy layer is the live yeast... That darker bottom layer is the yeast your wanting to leave behind... Since we use our yeast quite fresh, you are right... Shouldn't be a problem... BUT, if it is just a myth, why wouldn't we store our brews on top of the dead for longer periods.. I skim my yeast from the top... It's has more live yeast. Sneezles61