#4. A great storyline
Whether you admit it or not, The Miz's alliance with Shane has been an absolutely entertaining storyline. We've even seen the "odd pairing" story with The Bar before, and that was nothing short of outstanding.
This may be Shane McMahon's best storyline in a while, and they clearly have good chemistry together. Having them win the SmackDown Tag Team Championship would only add further interest to the story and we can see where it leads to.
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#3. A feel-good moment on the show
We all like a feel-good moment on the show. While Becky Lynch and Seth Rollins winning would be great, The Best Tag Team In The World are the clear underdogs in this match. With the crowd being clearly behind them, having them win the SmackDown Tag Team titles would be a great feel-good moment for the show, especially after Shane McMahon revealed his dream to become tag team champions as a child.
Wouldn't you love to see them win the tag titles?