yeah i have kept pictus with oscars and other aggressive cichlids and its fine, i actually have pictus in my tank right now (though i dont have an O right now) but i think as long you let them grow out a bit first and get the oscar as small as possible then they should all be fine, problems usually arise when you add a small pictus to a tank with an O that is already larger than it. but yeah JDs are more aggressive than Os so you may have a problem there, i would do an oscar with a severum and then 3 pictus and some silver dollars or something to add some more activity to the tank