You are never ever suppose to use cakes that have been exposed to mold this is extremely dangerous the shrooms could be contamed and you could die. Also cakes that aren't 100% colonized should not be taken out because then other contams have a chance to colonize the uncover areas by the miclium. The purpose of the vermiculite is to supply water to you cakes for better bigger fruiting. You would have been able to dunk you cakes multiple times and get flushes from your cakes but now that there is no vermiculite your cakes will probably die after the first flush. ( A flush is when you pick all the shrooms off your cake then they grow back and you can even go up to a 3 flush if you dunk.)Vermiculite is very cheap as well. This is bad technique and i wouldn't recommend any one flowing it.

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