#3 The Great Khali
Since making his debut in WWE, The Great Khali was ranked among the giants who previously had a successful run with the company. But as it believed by many, the same didn't happen probably because of his limited in-ring performance (as he was barely able to move in the ring). This limited style of him suppressed his major assets like the gigantic size and massive strength.
The reason for his massive push was believed WWE wanted to expand their business in Indian market due to which he worked with some of WWE's top star like The Undertaker, John Cena, Randy Orton, and many others.
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Last time Khali appeared on WWE Live TV was at last year's Battleground pay-per-view where he assisted Jinder Mahal to retain the WWE Championship. After this appearance of him, he wasn't seen anywhere near WWE which proves that WWE only wanted him for his Battleground appearance and they longer seeks for his services due to which they never rehired him and possibly don't have any plans to do so in the near future.