There are at least thirty separate organisms typically found in kefir grains. And, yes, yeasts generally can not ferment (breakdown) glactose. BUT several strains of Streptococcus bateria can ferment glactose. And, (drumroll).......Streptococcus Latis and Streptococcus Cremoris are typically found in kefir grains. To me, kefir grains are a true miracle of nature. It's astounding that thirty to forty mico-organisms can live together in a symbiotic colony.
If you really want to know how many teeth a horse has you're going to open his mouth and start counting. Just BSting about it doesn't get the job done. If you really want to know if there is glactose in kefir made from real kefir grains you have MEASURE it. Merely specultating doesn't cut it.
Yes, excellent post. Here is more on the elimination of galactose from kefir: