HC, even though he hasn't played a single game, I'd bet this has been a very valuable experience bringing Arturs over. Him being with the club, practicing, meeting with coaches. Knowing the way TN handles things I'd bet they let him know he might not see any game time.
I think this was more about building a relationship heading into next year. See if the fit is there. Besides, it's not like they pried him away from meaningful games overseas to come here and practice. His season was over and they payed him good money to come be a part of the organization so they could evaluate him more.
I think it was a pretty shrewd move by the org considering they have plenty of decisions to make this offseason. I think you are letting your like of the players and emotions about wanting to see him play get the best of you.
Either they figured out that he is a 'Jets' type player, and try to resign him, or either the org or Arty decided this isn't the place for him and will explore other options. Nothing wrong with that.