And yet our scoring per game has gone up only a point.
People are trying way too hard to justify the trade at this point digging up stats that have improved that show he's making a big impact but ignoring others that show he's had little impact (one being arguably the most important stat, scoring).
Also, if you go to some advanced stats, the impact seems minimal. From Week 9 to Week 10, for example, the Cowboys Offensive DVOA actually went down from 25 to 26 (they haven't updated through Week 11 yet). Their pass offense per Football Outsiders also dropped.
I think what it's telling us is that while on the surface adding a talent like Cooper at WR should/could help, there are more issues at play here to our offensive mediocrity than who was playing WR.