Michael Diggins told the police officer he had firearms in the center console because:
1) There is nothing illegal about that - he was within his rights and following the law
2) His license was in the center console with the firearms and he was going to have to unlock and reach into the console to get his licence.
Leonard Holmes had an open bottle of beer in his car, so the officers made him step out of the car. I don't know if an open container of alcohol is probable cause for a vehicle search or if the officers would have searched - my opinion is that they probably would have but that's just speculative since Holmes told the officers as he was exiting the vehicle that he had a gun in the car (in the back seat fold down arm rest).