It appears Raja Jackson has ended Syko Stu's time in the squared circle ... as one of the wrestler's good friends tells TMZ Sports he's sure Stu's in-ring time is over following the violent attack.

Raja Jackson is back in the spotlight, laughing it up on a new podcast while a serious felony case in Los Angeles still hangs ...

Raja Jackson has been largely radio silent since he was charged with felony battery following his attack on wrestler Syko Stu in August ... but that could be changing soon, 'cause his MMA legend dad ...