Not really, Miraak had thousands of years in Apocrypha to train and strengthen his voice, Vahlok has been dead in a tomb for that length of time. I would say if Miraak and Vahlok had fought again during the events of this DLC, Miraak would more than likely win.
Well nice job, ruining the only good reward you can get from this.

Doesn't really matter to me though. I kinda ignore special items because I can usually make something that's literally twice as good... since I have a ton of perks into enchanting and a full smithing tree.