WGA would almost certainly have sided with Larson in arbitration, since so much in terms of characters, locale, premise etc. was lifted from the pilot of oldBSG for nuBSG.
the subsequent announcement of Singer's involvement indicated that he would be writing the script for, directing, and helping to produce and develop the project.
Doesn't leave much for a 74 year-old rights holder to do. Maybe Larson can have a walk-on and pull focus?
You can put whatever kind of gloss on this you want - someone with actual modern film making experience and a track record was going to be put in charge of this thing or Universal wouldn't spend a dime on it.