CALeeIII

I was just adding up my flights for 1999 trying to decide what was the best plan for achieving elite status when I discovered something interesting. So far, it looks as if I will have a minimum of 68 segements to fly in 1999. The actual miles for these trips is roughly 30,000. Why would I want to put those miles with NW when I will only achieve silver status when I would be GOLD at CO using their SEGMENT based accounting? Am I reading this right when it looks as if I could count my miles in the One Pass program while taking a majority of my flights on NW and still recieve the same benefits? Have I found a flaw in this alliance? Shouldn't NW go to a segment-based system like CO and DL? Tell me if I have missed something here!