I agree.....his power comes at the end of his punches...particularly the left hand. But the problem is he drops his left all the time and can be countered. But if he touches you eventually you'll be put down or completely out.
Ali has a great technicaly sound jab that can give Valero hell if he keeps firing it. I think Ali did enough to beat Guzman, but he didn't show anything different from Campbell fight. He does the same thing. Valero can make adjustments as he brawls and boxes launching shots from different angles. This is a tough fight to call.