#3 The Singh Brothers and their contribution

A good wrestling stable isn't just about throwing athletes together and making them wear the same shirt. It's a balancing act where, ideally, the wrestler higher on the card will give a little 'rub' to those lower than himself, without damaging his own marketability.
The former Bollywood Boyz--a mildly racist gimmick--have traded up for new personas under the leadership of Jinder Mahal. With one fell stroke, they were able to shed their reputation as a comedy act, and are now taken seriously as both competitors and henchmen.
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Sunil and Samir are the perfect stooges for evil mastermind Mahal. They are smaller than him, increasing his physical presence when they appear together. Also, their in-ring style is faster and more acrobatic, lending variety to their stable. Most importantly, they can 'take the hit' for Jinder and lose to future/past opponents of his. This allows Jinder's opponent to build momentum for their match without hurting Jinder's credibility.
While some might criticize the WWE for again putting together an ethnic-based stable, there's no question that the union of Jinder and the Singhs has been a benefit to all involved.
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