actually Rei Zero, jellyfish have been fossilized. You argument is common and it is good in theory. i've heard that a starfish embryo from before the Cambrian explosion was fossilized. If similarly complex organisms existed before the explosion, they should show up in the fossil record.

also, we have intermediates thoughout the fossil record, but not the right kind. we have intermediates between different types of horses, but that's different. what about intermediate fossils with half-legs? don't use a snake as an example (with the dissapearing claw things) i mean a fossil. we need fossils with half-arms, or half-fins. we dont have nearly the amount of intermediates you think. what we have aren't what we need.