Good point. If a KG can be transfered merely through chakra [lmao], there there is no way it's impossible for someone to awaken a dojutsu that's in their genes.Kishimoto saying he forgot to give them Byakugan is a probably a joke, i think he didnt give it them simply because he found drawing Hyuuga with white eyes to difficult(lazy)and regretted doing it sense it was pointless.
Bolt has the potential to unlock Byakugan and at the end of the day Kishi will do what he wants. This is the same guy who gave Kakashi DMS so dont cry asspull if it happens in Bolts case.
Tenseigan is also possible for Bolt since it gives him a chakra cloak just like his Father and Grandfather.