I do not believe in any "3rd shooter/outside help" theory. I think the misrecollection of those students and witnesses were due to the cloudy senses of panic mode. Also, H/K started the massacre in coats, and ended half way through in their T-shirts. This may have threw off a lot at the time as being "seperate shooters." Also, I am sure H/K were able to carry the bombs into the Commons themselves; 20lbs is NOT heavy at all. I am pretty sure both 90% certain the plan was shared only between these two. Afterall, if one-too-many knew it would start a rumor...it is HS