Worth bearing in mind that the only time UDS swerved Cheltenham, was when Mullins had Hurricane Fly going for a third Champion Hurdle. That was a particularly unique set of circumstances, and there was no way he was going to put a stable-mate up in opposition to The Fly.
Great Field is more likely to be routed to the Ryanair, than not run at all, I reckon........though one of Douvan or Min seems more logical to step up in trip, given the way GF uses his energy in a race.
All Ricci knows about racing, is what he learns from Mullins, so he does what he's told, because he knows the trainer knows best. McManus, however, is a somewhat wilier old fox than RR, and whilst I expect he will listen to reason to an extent, I'd also expect him to be much more assertive about GFs target, than Ricci would be if he owned the horse.
We'll have a better idea as to what's happening once Mullins actually makes some firm racing plans for the three of them!