I think the Broncos keep 5
1) Von Miller (counts as a DE too)
2) Nate Irving
3) Danny Trevathan
I think Barrow makes the 4th spot - big competition between Marshall, McCray, Barrett and Nelson for the 5th spot.
Nelson has a Special team edge (maybe Bruton's replacement) - all the rest can be on the PS. McCray seem to have the edge for the last spot on the LBs. I think Barrett can be developed into a MLB - or another strong side guy.