Carlos...I have seen something similar to this once before.
My approach was to identify the stakeholders and agree on the scope to close the project. If the scope for the entire project had not been well defined before, that is now irrelavant as your focus is closing it down.
I would avoid the details that your team suggest you get involved in as you need to focus on getting agreement on what it will take to bring this project to a close...and quickly.
Once the scope to close it has been defined get this signed off by the stakeholders and set the expectation that they will be getting exactly what they have just signed off.
Draw up the schedule based on the scope and ensure that you get this signed off too in terms of the right number of tasks and especially the right number of resources.
Hope this helps. I am sure you will get a few other replies.
Cheers
Kendall