Interpretation of the ending

Rating: 10/10 (26 March 2005)

This is one of my favorite movies of all time. Looking through the comments, however, I realized that I had a completely different interpretation of the ending as most others.
Near the end, the Stowe character figures out who's responsible for the plague. And at this same time, someone from the future hands Willis a gun to kill this guy with. But the gun was huge, and my interpretation at the time was that the guy from the future *wanted* Willis to fail.
Then a few minutes later, when the real plague spreader sits down on the plane, he sits next to one of the leader's from the future.
So the question is, what was she doing on the plane? She was there as insurance, but was it to make sure that the plague spreader gets killed, or to make sure that he survives to start spreading the plague?Was there a group of people from the future who liked running things, and who were working to ensure that Willis *failed*?