Um, there normally is play between the turbine side heat shield and the turbine fins. It always should spin freely. Have you tried assembling the CHRA into your turbine housing to see if there are any clearance issues? Typcially there is a recess for the heat shield in the turbine housing and that play you see will be gone. If you assemble it and are able to rotate the turbine wheel with no rubbing, I would think you would be fine.
If all he did was rebuild it and replace bearings and seals, and it assembles fine as stated above, you should be fine.
Do you know if it was rebalanced? Oh and if it doesn't assemble well, then I would contact the rebuilder again and tell him getting your turbo back to square one is his resposibility.... $.02
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