Do you have any records of how little time he has spent with them? If not you need to show that he was NOT spending anything close to 50/50 with them even before "the incident". If he was only seeing them on day a week then that is the "status quo". All attorneys tell men to ask for 50/50 to avoid paying CS and to make themselves look good. Get any proof you have showing that he was not interested in seeing them more often.