Sounds like you've decided, but I will post a couple of comments to consider. I have a Northwest account which I opened about the time when the 10K promotion started. The rest of my family doesn't fly near as often so if we fly NW they put all their miles on their CO.

This month we flew NW. I had registered for a 100% bonus for connecting through Memphis and our itinerary got rerouted through Memphis. I was the only one to get the 2370 extra miles on WorldPerks. I was the only one to get the 1000 booking bonus (now increased, I think?). We also got food vouchers for the delay which could be used instead for 1000 miles each. Since these are not marked, I will go ahead and use all of them, so there is 4000 extra miles. In any case, I received 7370 bonus miles on this one round trip which would not have posted on a OnePass. Something to think about.