#1 Having Becky Lynch win

In all honesty, The WWE Universe already knows that Becky Lynch will be inserted into The Raw Women's title picture at WrestleMania 35, but the interesting part will be how it all unfolds.
Unfortunately for WWE, this has led to fans believing that Lynch winning on Sunday will be a foregone conclusion and thus has left little reason to watch it.
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With that being said and WWE needing a way to keep fans engaged in this storyline throughout Sunday's match, Lynch winning outright is something the company can't afford to do.
In fact, the company would be much better off to screw Lynch out of the win in some way and then leave the star-studded WrestleMania 35 matchup in the air.
At least that way, Sunday's match at Fastlane isn't too predictable, Rousey can come in and gain massive heat for screwing Lynch out of the match and it protects Charlotte Flair from taking a loss heading into Mania.
If nothing else, it's much better than just an outright win by Lynch and allows WWE to build a little bit more anticipation for the big match.