Easy mistake to make as I often refer to him as a little forward.
The statement about the middle forwards is to show they have depth when releasing someone, probably helps with the casual audience who might be worried with them losing a player.
Glad to see Ale is still in the mix as his status was unknown. Hopefully he can just concentrate on his rehab. Frei I haven't seen much of besides those few first grade appearances.
The others listed as options isn't a surprise as we have seen it, can also throw Katoa into the list.
The other guys will likely see more time in the middle if they insist on playing Aitken as a second rower. I'm still mixed on that yes he was good filling in but would prefer to keep him as a centre who fits in when needed.