#1 Face: Sami Zayn
The vignettes of a potential return of Sami Zayn and Kevin Owens have been airing on WWE TV since late 2018. As a matter of fact, WWE aired a vignette showing a possible return of Kevin Owens on the last edition of Raw.
However, amidst all this, WWE could pull off a real shocker if they decide to have Sami Zayn appear at Elimination Chamber.
On another note, Finn Balor will face Bobby Lashley with Lio Rush for the Intercontinental Championship at Elimination Chamber, and given Sami picked up a shoulder injury during his feud with the Almighty Bobby Lashley, it is apt to have him return during this match to equal the odds.
It should be noted that during his feud with Lashley, Sami was portrayed as a heel, thus, WWE could have him return to aid a helpless Balor getting dominated and attacked by the duo of Lashley and Rush. This would not only lay down the breadcrumbs for a potential triple threat match at Mania (which could turn into 5-way if WWE adds EC3 and KO) but also establish Sami as a babyface.