They got a good-but-not-elite player. Sergachev is a great #3. He struggles when the brunt of the toughs and defensive responsibility are thrust on him. Needs the infrastructure around him to be maximally successful. I don't think any competitive team should plan for him to be their 1D.Is it really "bailing out" if the other team gets a very good player out of it? Let's not pretend that Utah is just taking dead salary here, they took a player from TB that they feel can contribute to them now, and are giving up a fair package of assets to do so.
At 5v5, I don't think Moser is much of a downgrade. But he is crucially (for TB) a lot cheaper, and they also get some other assets they can use.
I think Utah is better on the ice in this transaction, but they paid a premium to do it. I think the Marino deal was much more shrewd.