At what point do you people start taking "anonymous sources" with a grain of salt. Seriously?
"congressional sources" shouldn't be publicly discussing what was or was not discovered during that operation with anyone outside of approved channels AND you simply have no way of confirming jack shit.
Also, of course, there is the quite obvious fact that this operation was planned months ago, based on intel the Obama Administration had gathered that led them to believe a raid was necessary and prudent. The only hold up was waiting for a night where the weather and moon cooperated.
Bitching about this raid is stupid, the USG engages in these sorts of operations all the time, sad as it is warriors sometimes die in war.