"...the Pancreas probably had a function,..."
Hmm. You might want to look up "pancreas" in a dictionary. It does some VERY useful things, like the secretion of insulin, glucagon (causes glucose to increase), digestive enzymes... it ain't no appendix.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=15228837&dopt=Abstract
the appendix is still very useful...to bad the assumption about it were not.