#4 Heavy Machinery wins the SmackDown Tag Team Titles
While Heavy Machinery are one of the few actual teams on the blue brand, I think it would be a huge mistake to have them win the titles now. Not only are they new to the roster, but they aren't new and so good that it warrants a title run. Ricochet is another story.
This might be a placeholder feud until SummerSlam, but one possible finish for the match is that the team of two large men capture the gold. It would be their first title win in WWE and NXT and it would put the titles back around the waists of faces.
Strangers things have happened in WWE, and if giving Rowan and Bryan the titles was a band-aid to fix the problem initially, then it is feasible that the 'Blue Collar Tough' boys win the titles. The rest of the division will become clearer and clearer with each passing week. People have returned from injury (AOP, Big E) and others may return from obscurity (Nakamura and Rusev).
If WWE wants a face team to carry the titles, then this might be the time for a title switch. It would be too soon in my opinion, but there are more teams of heels than faces on the blue brand. Mr. McMahon might also love the goofiness of Otis more than the fantastic heel work of Bryan.