Willie Colon will have a big effect on the outcome. He was with Ben all night. Will he say, "Ben never left the table at the same time she did", or will he say, "Yeah, Ben excused himself to the men's room around the time I think she left", or will he say, "I can't really remember much about who left when"?
Because if he can't say for sure Ben and the girl were never alone together, and if even one of her friends says they were, Ben is hosed.
Or, jeez, if this whole bathroom/hallway thing is rumor only, is she going to say he felt her up at the table? Unless she said "no" loud and clear, isn't that mutual?