As a soft Preds fan I hope Jokerit has a long playoff stint, ensuring he plays 9 or fewer games this season.
With Seattle all but confirmed, with a tentative start date of 2020-21, that means the next expansion draft will likely be in June 2020.
If Tolvanen burns a year this year playing 10 games, and then next season passes, and then 2019-20 comes, that'll put him over the threshold for GP and he'd be vulnerable in the expansion draft - all for 10 games in a year where NSH already has what it takes to win it, without a player like him.
But if this year slides and he officially kicks things off next year and then plays 2019-20, that puts him at 2 years exp and exempt from the expansion.