Sami Zayn
The Canadian superstar Sami Zayn can be hailed as one of the underachievers in the WWE as he is yet to win his first title on the main roster despite being one of the best in the ring. Zayn had turned heel in 2017 during his feud with Shane McMahon on SD Live.
He was sent back to RAW in 2018, where he got injured while feuding with Bobby Lashley.
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Roman Reigns
The Big Dog Roman Reigns was the prime superstar of WWE back then as he was the Golden Boy of Vince McMahon. He won the fatal 4 way but failed to defeat Finn Balor in the night's main event.
Roman Reigns is currently out of the WWE as he was diagnosed with leukemia in October 2018 and also had to relinquish his Universal title midway during his reign.