I think OKC will be fine, maybe a less talented more perimeter oriented version of the 2015-16 Thunder. As for Carmelo, I think this will be a defining season for him. He can distribute the ball, although he hasn't at an appreciated rate, and be a decent defender and should be if he's playing Power Forward at least... If he fails to be selfless in his role this year then I think the criticism of him will be justified. My concern for me would be him being efficient, he'll probably take more shots than PG because of his play style compared to George, of whom might have more of a conscious with the ball in his hand than Westbrook and Melo, making him the second option
As for Wade, man even as a Heat fan I am happy for him. A lot of people have concerns about their defensive issues but he's certainly a quality pick-up. Wade and Rose for under 5 Mil is a certified steal. I think IT/Wade starting could be fine, Rose/JR could also be fine but due to spacing and defensive issues, Rose/Wade should never start. Since IT is to miss significant time to start the season and Dwyane wants to start, I would start him at point guard right next to JR at shooting guard. With Lebron in the line-up, shouldn't be too many issues with ball movement
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Following my footsteps