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[quote=Anonymous]If grout is going to crack at change of planes, then the substrate is not sturdy which is allowing the differential bouncing.

Grout and tile were never waterPROOF.  Tile helps water resistance but that and grout are porous materials nonetheless.  Look water WILL creep around any joint in a bathroom.  The idea with tile and grout is to allow the water a way to breathe out and not get trapped in a moisture sandwich beneath your finish walls and floor.

Silicone will not resist water that is trapped behind it.  It will discolor with mold and crack.

Make your substrate good and solid in construction, you could opt to use a plastic sheet between stud and cement board.  Over the cement board you HAVE to use liquid applied waterproofing membrane (redguard, laticrete 9235, etc..).  Then you put on your mortar bed for the tile/stone finish.  Your GC might even purposely make little weep holes for water at the base of your wall before it hits the tub/shower floor. 
Some installers cut the cement board wall 1" ABOVE a shower mortar bed so as to prevent capillary action of water from wicking up the wall.  They cover over the 1" gap with tile/stone.

Here's the deal, if your walls are going to bounce, cracked grout is the last thing I'd worry about.  I'd worry about the waterproofing membrane behind the wall no longer being a continuous membrane.[/quote]

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