#3. Daniel Bryan

This may or may not come as a surprise to you, depending on how you perceive it. Daniel Bryan was cleared to return to in-ring competition around early 2018. It came as the best news ever, and Bryan revealed that he made a deal with WWE - after every match, he would get tested by the doctor.
Naturally, WWE, while sceptical, finally allowed him to do what he loves the most and he has incorporated a much safer style, also having one of his best runs during his time in WWE.
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However, the reality is that Bryan, while healthy, is essentially still on a thin string. While we may not know it, Daniel Bryan's career could end as abruptly as it had begun again. All it takes is one major injury for that to happen. It being wrestling, anything can happen.
We don't wish anything but luck to Daniel Bryan, but the reality is hard to deny. He is on borrowed time.