#4 Bo Dallas and Bray Wyatt
Bo Dallas' career was going great until he joined the main roster. The former NXT Champion's push lost steam soon after his debut and his "Bo-lieve" gimmick just did not get over with fans on the main roster.
Since his initial push on the main roster, Dallas has gone on to become more on an enhancement talent which is sad because he's great inside the ring. His run as part of The Miztourage and The B-Team saw him get a brief push last year.
His brother Bray Wyatt, on the other hand, has been a top star since making his debut on the main roster. Despite being booked in strange storylines sometimes, Bray has always been treated as a singles star. He's also a former WWE Champion but is currently off WWE programming as he waits for a new direction from creative.