Now this is strange.
I understand your assertion in the context of "blue 1x6 Bde moves east and two red 2x3 Bdes move west", as you've got unity of command advantage for blue in such a scenario.
Yet, modify this into a pincer scenario or let blue face some smarter red behaviour and you end up seeing an inferior blue unless it divides itself into dissimilarly behaving components. At that point, the advantage of blue is all but gone.
Now keep in mind the experience from WW2; namely that smaller formations are handy and practical, whereas large ones are clumsy until they fragment- and are very difficult to command when fragmented.
The practical experience seems to suggest that small is beautiful while theory cannot convince me that big is beautiful.
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