But it's the influence of the legendary Williams during his formative years at the Liberty Stadium that Walker will tap into, if he's called upon by Wales interim coach Rob Howley this spring.
"Shane's an outstanding player and a great friend as well. He's definitely someone to look up to," said Walker.
"I'd like to think I have learned a thing or two. He is any winger's hero in Wales and in world rugby.
"I was fortunate to have a few years training with him coming through the academy and then stepping up to the senior squad."
Few could have predicted the meteoric rise that Walker has gone through over the last six months, least of all the former Swansea man.
"My goals at the beginning of the year were just to come back fit after this shoulder injury I had in the pre-season and get the starting jersey for the Ospreys," he added.
"Confidence is growing with each game. I'm still learning and just enjoying my rugby.
"Ever since I picked up a ball it was a goal as a kid. It's a dream of any Welsh rugby player."
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