Hmmmm Jermaine has pretty fast hands though you can literally see the fluctuation in his delivery. Like anyone with great fast twitch muscles he has issues with sustaining power and speed for long periods of time. He does have good power just he lacks proper technique which is needed when attempting to maintain good power and more importantly consistant long lasting kenetic force. The guy needs to learn how to increase his endurance sorta like a long distance runner that maintains a good speed without utilizing (or wasting) your speed burst until that optimal moment. Whuuud up pimp!
I think he has decent ko power. When he laid out Carl Froch, the look on Froch's face was hilarious. That kid was GONE, funny face you can clearly see his eyes not focusing.
His power is where it is, nothing special, anyone with his athletic ability and frame will have the same. Average to good in my opinion.
Taylor has very good power. He had Pavlik out on his feet and a single good punch from being stopped and Froch down heavy with one punch. He is, however, a poor finisher. He punched himself out against Pavlik with wild punches and didn't go for the kill against Froch. He fought lazy fights against Ouma and Spinks, with no killer instinct after coming off three hard fights against Winky and Hopkins, both of which have great chins. As does Lacy.