I agree with Kayla, that both cats have thrown out their hid, based on Duracells pedigree he certainly seems to have inherited Galaxy Star from his Mum Fiona, but we can't be certain from what we are seeing here that its not Soul Whisper. Regarding Electra II clearly she has to hide either Galaxy Star or Soul Whisper and clearly passed it as Opaline is proven Dominant to Uber Odyssey. The only issue I can see is that we don't know for certain that Fiona passed Galaxy Star so we can't be sure if Duracell hides Galaxy Star or Soul Whisper, if he does indeed hide Soul Whisper then we can't know for sure what he passed.
Personally I have pulled Uber Odyssey twice with cats showing Galaxy Star and no sign of Soul Whisper in their pedigrees so I'm in agreement that its recessive to Uber Odyssey, but just playing Devil's Advocate.
Kittyclawz can you show us proof that Fiona hides Galaxy Star? That would clear this up completely. If not best way is to breed Duracell to a Soul Whisper to check his hid, or Fiona since we know he hides what she hides. I realise you probably want Uber Odyssey from him not Galaxy Star so checking Fiona might be better for your breeding program