Re: Magi 211
Great development indeed.
I doubt Sinbad will be revealed to be a villain, but as it was hinted during the time Aladdin and Co spent at Sindria that Sinbad is on some kind of mission and will go to any lengths to accomplish said mission. He is already half way into depravity (It was revealed when he chased that guy who infected Alibaba with dark magoi. Half of Sinbad's magoi is dark.).
I think he will be a dark hero type, walking partially in the darkness in order to accomplish a goal.