At first I thought that it might be the Reserve vs Regular Army Commission issue, but apparently the NDAA in 2005 gave every officer an RA commission.
The only other differences might:
A) The one mentioned in the article, in which former enlisted are good at the tactical (Platoon and Company) level. While those from West Point and the other military schools (Norwich, VMI, The Citadel, Texas A&M) are better prepared/trained for the operational and strategic levels.
B) O-1 through O-3 (2LT- Captains) who have more then 4 years enlisted are paid a higher amount then officer who are not prior enlisted. Which means they would retire at a higher amount.
C) They are in career fields that are "less" needed now that wars are winding down. Military Intelligence, Signal, Civil Affairs, MP's, Logistics. All the Combat Support and Combat Service Support arms will need much fewer officers and they shrink brigades and try to hold onto Combat Arms Officers.