WWE SmackDown results, grades (Sept. 18): Sami Zayn beats Kevin Owens, retains title with CM Punk's help

"WWE SmackDown" was in Corpus Christi, Texas on this Friday, Sept. 18, following last week's stunning CM Punk vs. Sami Zayn world title change in Mexico. After Zayn returned to world champion status, he was immediately forced to defend his throne when he faced Kevin Owens in tonight's surprise main event.The Zayn Reign!WWE has comfortably reverted to an "Attitude Era" type of world title scene with the Undisputed WWE Championship, making everything so messy (in a good way) it's impossible to predict what's next.An underlying narrative was teased tonight, asking, "Can Zayn hold the title for longer than his first reign?" He did so this time around, but not without the same chaotic finish as last week when he won it.WHAT IS GOING ON HERE??? 😳JOHNNY GARGANO AND CANDICE LERAE JUST INSERTED THEMSELVES INTO THE MAIN EVENT TO HELP SAMI ZAYN???