John Cena's year-long retirement tour will conclude this weekend at Saturday Night's Main Event XLII, as he will compete in his final match against Gunther. The Ring General defeated LA Knight in the final of the Last Time is Now Tournament on last week's episode of SmackDown to earn the opportunity to face The GOAT in his last in-ring outing.The former Imperium leader sent a stern warning to Cena after beating LA Knight last Friday, claiming that The Franchise Player would tap out in his final match. It would be a poetic conclusion to The Last Real Champion's career, and while many are against the idea of the legend tapping out this Saturday, it should happen.In this listicle, we will detail three reasons why John Cena must tap out to Gunther at Saturday Night's Main Event XLII:#3. Making John Cena tap out would establish Gunther as the top heel of the companyDefeating John Cena in his final match is one thing, but making him tap out to secure the victory? That would immediately make Gunther the most hated superstar in the company. Fans adore The Cenation Leader and are sad to see the legend hanging up his wrestling boots. His retirement is sure to be a bittersweet moment for everyone, which is the perfect opportunity to turn Gunther into an even bigger heel than he already is.Cena has said multiple times that he wants to elevate the next generation on his way out. If The Ring General submits The GOAT in his final match, it could make him the top villain of the company.#2. It would help Gunther redeem himself Gunther lost the World Heavyweight Championship to Jey Uso at WrestleMania 41. The YEET Master applied the sleeper hold to make The Ring General submit and win his first world title in WWE. While the Austrian star regained the title from Jey a few months later, the loss at 'Mania still haunts him.The former Imperium leader still gets the "You tapped out!" chants from the audience every time he competes. To re-establish Gunther as the dominant force he once was, he must make John Cena tap out this weekend.#1. The shock factorJohn Cena has lived by his motto of "Never Give Up" throughout his career. By doing so, he has served as an inspiration to many. No fan would even think about Cena tapping out in a match.However, with the veteran bidding adieu to in-ring competition after over two decades of being Super Cena, he could finally show his vulnerability and give up in his final match. In a Superman-turns-human type of moment, Cena submitting in his final in-ring outing would send shockwaves throughout the wrestling world.