Powerful inside centre Dewey, who has won 13 caps, showed great promise for Scotland during their run to the World Cup quarter-finals.
But the 24-year-old appears to be carrying an injury after his summer move from Edinburgh to Ulster.
He seems to have lost a bit of form and is not being given a regular start by Ulster, despite the Irish province being rooted to the bottom of the Magners League.
Our verdict: COLD STORAGE
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