Taijuan Walker is going to the bullpen now and he’s not going back. He won’t be moving back and forth if there should come a need in the rotation. He is a reliever for now and will need to embrace that role.
For his part, it sounds like Walker has been all business about the move. Multiple outlets are talking about how Walker has been very professional about the move and plans on doing exactly that, embracing the role. Feeling his stuff might take a bit of a leap, Walker is ready to go and do his thing.