Earlier on Thursday the judge told the jury they would have to find the brothers not guilty if they thought they were using their mobile phones at the time Damilola's body was discovered.
Telephone records showed that calls were made at the time Damilola was found, in an area around two miles away.
Reason for death disputed
The prosecution say the brothers killed Damilola by stabbing him with a broken bottle, but the defence say he fell on shattered glass and bled to death.
Mr Dennis also said the brothers had told people in two young offenders institutions about the attack in South London, on 27 November.