However, it's doubtful the Sudanese have anything sophisticated in the area of air defense/detection requiring such subterfuge. Egypt is currently occupied with internal issues. I wouldn't be surprised if their post-Mubarak command structure has had an effect on reaction/competency.
I find the timing and possible use of a submarine interesting. Israel has been conducting air exercises with other Mediterranean nations. Iran is in the midst of a naval excercise.
Whatever the reason for the strike, I'm sure it was important and legitimate. It's also a pretty good opportunity for a warm up act if the head east next time.
Unless Israel claims it so, how would anyone actually know Israel used a sub or stealth planes in a “strike”?