Well, your response is still fascinating to me. My son was putting together the map of Australia in the one month we stayed in a well-regarded Montessori that was a spectacularly bad fit for us, the teacher complained that he did not look at the map, and do it from the top row and left to right. We were told that he could not proceed academically until he managed to roll and unroll the little mat exactly the way they wanted it. I cannot imagine our teacher will like anyone doing the 100 board randomly, let along lamenting the fact that the material was not used more creatively.
I think your son is following the Montessori philosophy more closely than the teacher whether he knows or not.
I would not worry about setting her straight. I am sure his creativity will show when he is faced with a more challenging problem.
