Walker has been identified as an athletic freak by some on the media. Michigan coach Jim Harbaugh touted Walker's shiftiness in February — his 6.10-second 3-cone drill would be faster than any prior time in NFL Combine history — as he switched from wide receiver to cornerback. An injury-riddled season followed.

Walker was projected to be a breakout player for Michigan last season before he was bitten by the injury bug. He played in six of Michigan's 15 games, totaling 66 snaps, all on defense. He allowed three receptions on six targets in coverage, with one pass breakup. He finished with three tackles, and did not play in either of Michigan's College Football Playoff games. He played the seventh-most snaps among Michigan cornerbacks this season.