Is this a loaded question, haha? If you have a cut, does the person with the main plant know yield? I suppose too, without knowing what pheno of the starfighter that was chosen for cross (LAD or Tahoe leaning); as well as the bullrider (original more sativa vs afghani leaning), could make it pretty wide ranging. If the afghan bullrider was more affie leaning and the starfighter was more tahoe leaning; I would think that to have a good chance for a keeper. My bullrider doesn't tend contribute a large portion to flavor, so if it's similar with your cut; may be mostly flavors from the starfighter.
My bullrider would be a medium yielder (350-450 g.p.s.m) I suppose. It has a shorter node spacing, branchy and puts energy more across the whole plant rather than developing large colas. With this structure a chunky, apical dominant and high node space indica heavy can benefit from this cross; in terms of yield and form. A hybrid with large node spacing, branching and a 60/40 or 70/30 (indy favor) could possibly combine with poor bud form and likely marginal change to yield; if not lower than hybrid. This would just be how mine has behaved so far on the bull end, but not tested many with it yet.
hope that helped anyway :). I would love to see pics if you run it out!!