Update:
I reseived some information that cleared up my thinking so I am passing it along to anyone else.
Deployment Packages do a little more that just send presentations to a DMP.
What it will do is look at the list of presentations and files that they need and look to see what is on the DMP currently.
It will then remove the presentation files that are not needed bbut already on the DMP and then push the new presentation files to the DMP.
That way by looking at the deployment package, you know what presentations are on the DMP.
Hope that this helps.