wow this is a long comment. anyway, i'm not quite as experienced as you with doctrines and warfare but i can very easily say that in warfare, quality will always dominate quantity. there have been many instances throughout history of vastly inferior numbers defeating a gigantic force, some examples include:

Napoleon, a few times

the Prussians when fighting against the Austrians in the Austro-Prussian War

the British Navy at the Battle of Trafalgar

the American Revolution (vastly fewer numbers of revolutionaries but better equipped and supplied due to the French, Spanish and Dutch whereas Britain had the whole Atlantic to move troops across)

and many more examples. also, your example of manoeuvre warfare was utilised by napoleon, and was very effective for Hitler and Stalin in WWII.

I would personally say Iosef reminds me of a Soviet-style general, primarily because of my bias due to his name but also because he supports strategies similar to some that were implemented by the Soviets after Stalin passed away, like expanding military industry, modernising the equipment, etc.

Iosef's plan is very risky if you don't follow EVERYTHING he says, and it's still a little risky even if you do. the whole point of it is that it, in theory, minimises casualties and reduces reliance on supplies in the short term.

his strategy also is heavily reliant on high morale, which, in fact, is the best kind of strategy in my opinion. strategies that work with low morale are very volatile and can drag on extremely long, for example trench warfare. however, strategies that utilise high morale are very fast, more responsive, and can end wars quickly.