I'm not assuming that he is. I'm literally not assuming anything. I'm simply saying that it is not certain that he is going to give Watson the 1 year/indefinite the NFL apparently craves. He very well may do that, but he might not. So why not wait?
Sure there is. The contract leaves the ultimate decision on the punishment to the Commissioner. The Commissioner decided to appoint someone to hear the appeal, but it is still the commissioner who signs the piece of paper. If Harvey comes back and says "One year, indefinite", there is absolutely nothing preventing Goodell from seeing if a deal can be worked out. After all, who is going to object?? The NFL will still have an incentive to settle of some kind, because they'd obviously rather not have him serve just 6 games, play the rest of the season, and then have the court action resolved next year so he misses more games in 2023. Is that enough of an incentive for Goodell to settle for something less than a full year/indefinite? I dunno, but there's certainly nothing preventing that from happening.
I see no reason for Watson not to let this play out, then cut the best deal he can if necessary.