If this is either a vet minimum, or non-guaranteed deal, which I would expect is the case, this is an absolute no-brainer. Miles could be the perfect, long, athletic defender to throw at Lebron, if he is in fact healthy. There is no reason not to give him a shot to come into camp and earn a spot on this team.
At the very least it should make the preseason much more interesting.
I do wonder if this means that Walker is on his way to Europe though.