Eh, not necessarily - I can see how if you need to recreate part of it as CGI anyways it might be easier to recreate the whole shot rather than just the BOP plate.Could it be that shot of the Saucer sep is now "owned" by Paramount and not CBS? I bet that's why we got a new shot of the Bird of Prey in Sins of the Father, and I'd be willing to bet a pint on the fact that the Starbase in 11001001 is CG'd too.
Makes no sense to me. They'd have kept the Ent for SoF if it was just that.