Major Bill, I respectfully differ about "One of the basic requirements was West Point education." Perhaps for the highest level of command it was necessary to have that education, but a quite a few brigade and division commanders weren't West Pointers. Some corps commanders weren't, either. John McClernand comes to mind as one corps commander, and I don't believe Ben Butler went there either. John Gordon and N.B. Forrest weren't students at the Point either. Some, like J.L. Chamberlain and Strong Vincent, graduated from other colleges.
I would suggest these men were promoted for other, more important abilities than their educations. While neither you nor I may have made a good Civil War general on the field of battle, surely Montgomery Meigs has not been given the recognition he deserves as a quartermaster, even with a West Point education? Overall, he did keep the Union Army supplied.