Considering he can and I quote"taste when something is wrong." In battle I'd say his knowledge is instinctual, he did learn how to fight, he lived it.
Assuming Scandrial wins early battles is completely unreasonable.
One Radiant is worth at least 200 untrained Scandrian soldiers.
And there can be hundreds of them.
Add the Fused, Heralds, Unmade and Scandrial has exactly one chance and that is Kelsier.