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UFC predictions: Why some experts are wary of TJ Dillashaw's return after a 2-year suspension

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Dillashaw on being upfront about his failed drug test (0:54)

TJ Dillashaw talks with Brett Okamoto about why he's been open about his failed drug test. (0:54)

Few people have better insight into TJ Dillashaw and Cory Sandhagen -- the headliners for Saturday's UFC Fight Night -- than Raphael Assuncao. And even he has major questions about Dillashaw coming off a lengthy layoff.