Even discounting all of that, the judge/jury/arbitrator/litigator would have to agree that sending him into quarantine and not others constitutes retaliation. To be completely honest, this kind of job is a huge joke. If you take too many bathroom breaks you won't hit your quota and they cN fire you for that.
The only way to win isn't to prove he was treated inconsistently, that can be ignored so long as the reason they stated for letting him go is true.
And arbitrators are always required to be agreed on by both parties.
This sentence is simply false.