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FriendlyNeighbor said:
Err,left over nutrients in cakes, yes. But as for crumbling and casing them, theres been talk that it won't be a good idea because the mycelium in fruiting cakes already stopped their vegetative growth and has switched to the next stage in their cycle which of course is to throw out fruiting bodies.

I would not suggest breaking them up and casing in hopes of creating one  bigger badder fruiting machine.

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exactly correct

also, should it work (which is iffy) crumbling cakes after they've flushed and casing them will actually hurt your overall yield.  they'll waste nutrition, energy, and your time recovering and stitching back together, when if left alone they could have just been growing more mushrooms.

yes, there is a caveat that you could add them to a bulk substrate at that time and since you'd be adding more nutrition, you could theoretically improve the yields.  but again they won't be as vigorous as they are when they're young and the chances of that working out are also slim... they're likely to either not colonize the bulk substrate or everything contaminate you on the process.  best to leave them as they are, make some more cakes, and experiment with casings or bulk spawning with fresh ones