I was more meaning like if a back/half got injured (legally) and you had to use an interchange.I was told this doesn't happen when discussing Walsh's omission. It's a great tactic.
But I also don't hate the tactic from Qld if chasing points throwing Walsh out there... you'd probably put him to Fullback and bring KP forward though which is kind of disruptive. I like it a bit better with a Dearden Munny halves pairing - with Walker already being a bit more creative it could be too many cooks in the kitchen.