#3 To fully pave the way for Dominick
Rey Mysterio was about to retire in 2019 as well, but it was his son Dominick who stopped him, telling him that when he debuts in WWE, he wants his first match to be him teaming up with his father.
While it's still a possibility, there's also a slim chance of it happening anytime soon given the nature of the COVID-19 pandemic. Moreover, a moment like Dominick's debut is something that needs to happen in front of a live crowd to truly capture the moment.
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With that said, there's a high chance that Mysterio's retirement could put an end to that - and it might be for a good reason. The WWE legend is aware that his son is going to have to work harder than every other Superstar because he has an extra chip on his shoulder.
We've seen the case of Charlotte Flair and how she started by being in her father Ric Flair's shadow all the time, with unnecessary comparisons. With hard work and time, she's moved out of that shadow and is now creating her own legacy.
Mysterio may want that for his son and he understands that to do so, he needs to step away.