#1. This six-man match was Roman Reigns' return match
Love him, or hate him, you can't ignore the fact that WWE considers Roman Reigns to be it's most valued full-time employee. Reigns headlined various PPVs ahead of other deserving matches (for example, Reigns headlined Backlash against Samoa Joe in a normal non-title match ahead of the WWE Championship match).
Now, since Roman Reigns is back again, WWE is greeting him with open arms. After surviving a horrific illness, it would be only a surprise if WWE didn't put Reigns into the main event. And they have done just that. Ahead of the triple threat WWE Championship match, the Big Dog along with his Shield brothers headlined Fastlane 2019 against the squad Baron Corbin, Drew McIntyre and Bobby Lashley in an impromptu six-man tag team match.