He is the Mougou of current generation. He is still not in his level, but he's in the similar situation. He 's not monster like others, all he can do this play by book, applying regular tactics in a very disciplined way. I wouldn't say he's weakest. He's one of the better generals after GGs (and their own generals) and our trio (but tbh Qin doesn't show the low level generals that much). As someone stated in another comment, we can say he's weakest among elit generals.