Almost all of the "current" 2016 rosters available via the community files on M15 360 originated from 3 or 4 people. Others downloaded them and just kept uploading them daily with minor changes without crediting the original creators, so those 3-4 people quit uploading new files.
I'm looking at the most downloaded M15 2016 rosters on Madden share and not one of the rosters with over 4000 downloads is from the original creator. (The legend rosters for the most part are originals.) There hasn't been any updates because there are no original roster creators left for the top uploaders to copy.
As far as community 2016 rosters updated in the past 4 months, they originate from just 2 rosters. The first is from DogmanTKO that was created in May 2015 and kind of updated. I know because over 100 rookies I created are imported into his roster. (I volunteered them) I gave them a 4 KAC rating to find and sign them easier in free agency.
The 2nd is the M16 preseason roster update that I got from Chryder85 here on Op Sports then ported to M15. I didn't even finish the file completely before everyone started reuploading it. (I was still checking for green faces and retiring players from franchise mode) I quit updating in September because when I update, someone with more downloads simply posts my updated roster over their file and claim credit. I watermarked my gamertag into the hometown of hundreds of retired players so I could differentiate my ported roster from any others ports that arise and have come to realize that almost all the current M15 2016 community rosters came from just these 2 rosters.