Walker has a bad combination of small size and big heart. Can't help feeling if he chunked up a bit he might be more resilient to some injuries to do with muscle/ligament. Shock injuries are harder to mitigate, but he looks hurt in almost every tackle (then again so does Hurrell... who may be bigger but maybe not in peak condition on the other end of the scale..)
We have one or two fullbacks coming through the ranks too - I honestly don't see Myler as the solution long-term. He had a great performance in the CC final, and his skill and awareness is world class sometimes, but I felt we started to see the bad side of Myler's game appear again towards the end of the season too.
Another surgery and some more time for Walker must be needed - hopefully he'll be back fully fit, strong and raring to go from Easter ish next year. He was looking like the next England full-back a couple of years ago with MoM performances regularly.