As others have said - you won't be able to double-dip on CO and DL (or CO twice). I have been able to request original routing credit when an involuntary change has decreased my mileage earnings, even on CO or a partner (like when they did me a favor and rebooked a mileage run into half the segments). But I couldn't get credit for both - just whichever routing I requested.

It sounds like you still came out ahead in mileage (though you probably took a drop in EQP, flying on Delta). If that's true, I'd be fairly satisfied. They got you home and the new flights boosted your miles! Even on other airlines, ORC is often discretionary and often difficult to obtain.