Numbers never win by themselves and can even interfere with winning unless they are properly handled.
Lee and Jackson were facing mediocrities until the Union found competent generals. That is not to say they weren't great generals for they were but facing McClellan? Come on. Did numbers help him? Lol and his forces always were larger than Lee's.
Actually, McClellan was an excellent General for training troops. He had a serious flaw. He loved his troops to the point that he couldn't stand to sacrifice them at all. He was the opposite of Grant. From a modern war standpoint, Grant was an excellent General. He would sacrifice his men no matter how many got killed, to achieve his victory. it obviously worked. Lee was willing to sacrifice men, but only to a point.
Where did you pull this gem?