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Randy, grout will not make your tile lippage issue go away. It may make it less noticeable, depending on your grout line width. Assuming you have nearly 100% thinset coverage (especially at the corners), the lippage will not cause the tile to crack or come up, but it may be a toe catcher. If you decide to reset the tile, and you only very recently installed them, it may be possible to pry up the offending tiles without damageing the neighbors. Cut the Ditra with a utility knife, then slip a prying tool in. Pad the neighboring tile with something to prevent chipping. In some cases, deliberately breaking the offending tile is prefferable to cracking a perfectly set one. One such case is when the grout line is too thin to get a pry tool into place. Hopefully, you have access to a couple of spare tiles. To replace the tile, clean the subfloor of any remaining thinset and Ditra fuzz, then cut a piece of Ditra and install it as usual. Ditra can be butted together and you don't need to overlap or cover with Kerdi-band unless you were waterproofing this floor. If you were, seal the butt joint with Kerdi-fix. Install the new tile as before, but with less lippage this time.
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