Law talk alert:
I get all the hand-wringing about the scummy people that MLB is relying on to support its case, and even the scummy people that are MLB itself. Such screams of scumminess resonate with the public, but, for better or worse, that's how people are prosecuted every day. The person who takes the the deal from the prosecutors first testifies against the others. The plurality, if not the majority, of evidence against accused drug people comes from other drug people.
I assume that all of the scummy facts about Bosch were laid out in front of the arbitrator. He found Bosch credible enough. Obviously I dont have the benefit of a transcript to see if any of the testimony was just patently unbelievable -- "we travelled to a rest area on the planet Jupiter. . ." or he came up with dates where ARod was indisputably elsewhere. But otherwise, in courts, its a pretty rare credibility determination that gets overturned on appeal. In an arbitration proceeding its even less likely.
All the whining about scumbags and hearsay is Arod and his lawyers capitalizing on the fact that baseball fans also watch TV. It is not legal talk, of which he and his team have very little to talk about. and Arod post-decisional whine about a "jury" is patently bullshit. He surrendered his right to a jury when he signed (by proxy) the CBA. (Obviously he gets a jury if a Govt charges him criminally.)
As for the non-law stuff....yeah, MLB is seemingly out to get him, and is punishing him for being an obstinate dickhead.
But ultimately, the final decision in this case will be something along the lines of, "The arbitrator was entitled to rely on the evidence presented at the hearing, and his conclusion was supportable in light of that evidence."