There is no reason to believe Chmelevski can't outperform Lindblom, Lorentz, Svechnikov, Gregor, Zetterlund, or any of the cuda forwards other than Eklund. If you do the league differential calculations (or believe in them), Chmelevski's KHL season would translate over to the NHL with higher totals than any of the above players have ever had, and most of them are a few years older.
This decision means he probably isn't going to play in the NHL ever, for any team, and I think that's a bad move for him. But he's only 23, and he could decide to stay in the KHL forever and just be a name over there. Regardless if he was a bust or not, his time in SJ was extremely poorly handled.