No stencil, no contract. Therefore, it must be a stock racket because no contact means no in depth connections to hook himself up with a paintjob, though it could possibly be hand picked by friends in high places. Regardless, his specs would be customized to the same numbers and to perform nearly identically so Wilson's quality control shouldn't be TOO much of a factor.
As it is a stock frame, it MUST be what it appears to be, a leaded up BLX Six.One Tour. The general characteristics of the racket itself (string spacing, pallet length, string pattern, box beam, and PWS) suggest that it is one of two rackets - a K90 or a BLX90. But since it's highly unlikely to be a paintjob, my deductions lead me to believe that it can only be a BLX Six.One Tour, and that he does not have a contract with Wilson. He is probably freelancing and liked the BLX90 for some crazy reason and switched to it.