A recent article suggested that Stoner rides the bike fast regardless of feedback, and that his willingness to low side and crash in previous seasons masked the fact the bike wasn't great.
Secondly, the lap times are faster this year, it may be more that the rest of the field has improved their machines, but that Ducati were struggling to make headway with the GP11 compared to previous seasons.
Finally, the gap to the front is coming down, if similar advancements have been made again, then the Ducati could be competetive once more.
I'm not a Ducati fan particularly (I ride a Yam, and follow HRC in racing), but I don't think anyone on this forum is in a position to really know what's going on, the only thing you can say for certain is that if Rossi can't win on the bike, that there is a high probability that the problem is the bike, and that just because someone else could win with the same bike last season, does not mean they would be competetive this season.
IDC tbh, BSB is 10x as interesting as Moto GP anyway!