I literally just gave you a few?
1- If a contract is signed with a KHL team he cannot break it and play with an NHL team.
2- In this case, the farm team is a 45 minute flight from the parent team, not an international flight involving customs, work permits, and the like.
3- The player can play for coaches who are very familiar with the style played on the parent club, and play with players who either will play, or have played with the main club. Coaches in the KHL don't give a shit what style the Wild play, or how he will fit into the big picture.
4- The prospect will be playing in an arena and culture that is very similar to the one in Minnesota.
All but the most talented players spend time in the AHL for those, and other, reasons. I don't understand why a player like Khusnutdinov would be too good to play in the AHL, or "ruined' by the experience, when players like Brodin, Granlund, Fiala, Suter, and Parise all played there. It is the easiest way to introduce a player into the NHL. If the guy is talented, he will shine and be called up to the big club.