#3 To set up Dominic vs Joe
After his embarrassing loss at the hands of Rey Mysterio, Joe came back and ruthlessly attacked him inside the ring. Rey's son Dominic, who had come to celebrate his father's victory watched Joe ambushing Rey in front of his eyes.
While Dominic did have a look of helplessness at Money in the Bank, one has to wonder how long can he see his father being disrespected by Joe? The reports are that Dominic has signed an official contract with WWE and if that is true, Joe sure seems to be the correct first opponent for him.
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Joe losing the US Title was necessary for this feud to start, as WWE won't put Dominic directly into a championship feud, considering he is still relatively new to this.
#2 Retribution for the WrestleMania 35 embarrassment
Before their encounter at Money in the Bank, Samoa Joe and Rey Mysterio had a match for the US Championship at this year's WrestleMania as well. The ending of the match was the exact opposite to what we saw tonight as Joe pretty much squashed Rey quickly to retain his title.
Fans were caught off-guard with such a shocking defeat for Mysterio and his win at MITB looked like perfect retribution for that embarrassment that he faced at the Show of Shows last month.