"What is the difference between Diamond last 3-5 years and now??"
Besides the current possible accounting fiasco, I'd say some meaningful events have taken place the "last 3 - 5 years", no??? Of course what's happened in the past pales to the proposed Pringles purchase; if the deal closes, DMND will be a very different company (including fundamentals!)
2008: Diamond acquired Pop Secret popcorn from General Mills. 2009: Emerald adds 100-calorie portion control nut packs and hits ten percent share of the snack nut market in U.S. food stores. 2010: Diamond acquired Kettle Foods potato chip company with operations in the U.S. and the U.K.