In April, Mr Okowa, his successor Sheriff Oborevwori, and Delta State lawmakers defected to the ruling APC.
Mr Ayuba, the fifth prosecution witness, said the N416 million received in tranches was returned as $1.137 million equivalent.
The Abuja Division of the Federal High Court has fixed March 7 to hear a motion filed by former Governor Willie Obiano.
He said the EFCC was neither the agency that arrested Mr Ekweremadu and his wife in London nor was it a party in the case abroad.
January 25 has been fixed to rule Mr Ekweremadu’s plea against forfeiture of his seized
Mr Umar made his statement on Wednesday while fielding questions from the prosecution counsel, Sylvanus Tahir, at the Federal High Court, Abuja.
