Um, its not so much DJC as his Down B forcing Yoshi to flip in the air and fall... But seriously, double jump attacks seem amazing for edgeguarding so far. Just neutral air them right after double jumping and you will hit them away while gaining all the jump distance to get back...
And imagine the sick edgeguards from double jump forward air? As in, jump off the stage toward them, wait until you are below them, then double jump and forward air at the same time so that the wind up time takes place as you are moving up toward them? Bam! Right as you reach them you should hit them down if you time it right... I cant wait to practice these things...