This is different than the Melart and Hjalmarsson signings since Hannikainen is a multi-year ELC. So, he could go back to Finland and that wouldn't be a problem. Maybe another year over there would be helpful for his development. Teams like Detroit let their Euros develop in Europe rather than rushing them over. Even Detroit has had issues developing Euros in the AHL, and it's not always the best for players to try to both adapt to North America and learn to be skilled, offensive players.
The number of young forwards potentially in Erie next season is going to be crazy: Anderson, Rychel, Milano, Tynan, Bjorkstrand, Zaar and now maybe Hannikainen. That's assuming Wennberg and Dano remain in the NHL. Plus there's Karlsson. That could be 3 lines.
The beat reporter for the Helsingborgs Dagblad keeps suggesting that Zaar could sign with his hometown Rögle who were promoted to the SHL, rather than playing in the AHL next season. That's not up to Zaar, since he has a contract with the Jackets and they're likely to tell him he's in Erie. But a lot of European players would rather stay at home at a top level league than have to play in the minors in North America.
I could see Hannikainen staying in Finland for one more season after signing his ELC just because he could get buried in the lineup in Erie if he does struggle. Having that many rookies didn't help Springfield this season. A strategy of inserting 2-3 rookies into the Erie lineup rather than trying to coach a team that is almost entirely 1st and 2nd year players would be a better strategy.