Otiko was hired on as a consultant, correct? If he was an equal partner in this process, he might have a claim worthy of some consideration in court. But, if he was contracted or temporarily employed to do a job, which is my understanding, it's a completely different story. He probably would have signed an agreement forfeiting any legal claims to the work he, Keough, Phillips, et al collaborated on.
In that event, it doesn't matter if the patent was previously "abandoned." Otiko traded his expertise and time for money. If he was in fact paid, and assuming the terms of his contract were not riddled with negligence, it doesn't matter if the patent associated with his work was abandoned or not. He would have no legal claim to it.