When Collier leaves after this year, she's going to leave a pair of "her best game shoes" behind that Walker will be expected to wear (fill). This year, Collier and Samuelson are doing most of the heavy lifting. Next year, that task falls to Megan and possibly Williams.
Right now, most of the plays go to Collier and Samuelson. It would be interesting to find out exactly how much latitude Walker has during a game with respect to taking shots. For the next two years, she will have a "bright" green light from Geno, like Pheesa, Chrystal and Samuelson do now.