#2 Samoa Joe

Samoa Joe was the first to be eliminated in the WWE Championship Elimination Chamber match. But that has been the case since he has debuted on the main roster, as he has yet to achieve anything big in WWE after two years of his main roster career.
Joe's run in NXT was exceptional and he was the first-ever two-time NXT Champion, before that he competed in other promotions such as TNA, Ring of Honor, etc. were he earned huge amount of respect with his rivalries and title wins.
He is one of the best wrestlers in the world today and has god gifted promo skills which is the best part about Joe, still, WWE have not utilized this massive star properly. As he yet has to win the main roster title in WWE.
WrestleMania 35 is nearly a month away, and still, there seems no plan for Joe at the event. Its high time WWE realize his worth and give him a big push that he deserves. It would be amazing to see him win his first main roster title on the grandest stage of them all.
#1 Mustafa Ali

The former 205 Live star is the newest member of the SmackDown roster and he has already begun his way to the main event picture. Since arriving on the main roster he took WWE by storm when he pinned WWE Champion Daniel Bryan.
He lasted nearly 30 minutes in the Royal Rumble match and he was set to be one of the participants in the WWE Championship Elimination Chamber match until he injured himself. He was later replaced by Kofi Kingston in the match.
It was earlier reported that Kingston's performance in the gauntlet match as well as in the Elimination Chamber match was intended for Ali instead Kingston got the push. This has impacted Kingston's career since he will get another chance at the WWE Championship.
Now, this clearly means WWE was indeed very high on Ali until he suffered an injury. It is possible that his massive push resumes once he recovers. He could perhaps face Daniel Bryan at WrestleMania 35 which would surely make him a top star in WWE. Already he is known as the "Heart of 205 Live" soon he will become "Heart of SmackDown".