i would say that you are onto something in that if you place your sounds at different times (filling up all the Os) instead of playing them all together on the down beat, you will get a fuller sound without having to rely on as much use of eq to separate the sounds.

but also consider that you might want to leave some empty spaces so that the sounds have a chance to breath. it's probably good to find a balance between fullness and space. (not that i've been so good at finding that balance myself, but hey, we're all working at it! ) ;)