lets lay out the facts shall we....
1. Manning knew about Brandon's being let go. The Dolphins knew about the incident and informed him of their decision. Look at the timeline. The Dolphins would be below incompetent to not tell him.
2. Manning has not said we are out of it. ( even after Marshall)
3. Since Manning knew about #1, the Dolphins have a plan in mind, which was good enough to keep Manning in play.
4. Many intangibles still favor us, and could be the tipping point.
that leads me to believe that we are still in it, in fact I think it's between the Titans and the Dolphins if you ask me. Still crossing my fingers.