At the time of the signing, besides the 2 NHL goalies, they only had Dobes under contract. He just completed his rookie season, and it would be a huge mistake to play him in the NHL if an injury occured to the other 2.
I don't know anything about his personal life, but at 27 there are considerations such as what country you want to educate any children in, Canada or Switzerland?
He is guaranteed $225,000 regardless of playing in the AHL or ECHL. Most importantly he is a UFA at the end of the year so if he shows well, will be free to sign with anyone that offers him an NHL backup job.