Maybe this is a stupid question but where did the B2s come from
Where did you get the info that they were B2s? Reports are that a single B1 was used. They have been flying stacked over Baghdad with different planes with different munitions to be available on demand when called in.
http://www.canada.com/news/story.asp?id=%7BD1C1A1EB-CD3F-4B18-92FE-623ACFB54AB6%7D The attack was carried out by a single B-1B bomber which dropped four 900-kilogram bunker-penetrating bombs on the residential building, military officials said.
I know at some point it was via Diego Garcia.