The kid was under 4. And montessory as original philosophy really was not about learning to make educational choices.
Montessory was designed for troubles boys originally. The effect it was supposed to have was that the kids that fail get some order and controll at the same time and build good working habits.
It worked for non troubled kids too and had good results, but it was not designed to push kids fast forward.
dfee's son was denied that choice, and hence the effect that montessori is supposed to have may not take hold.