Height is clearly an issue.
So, Astbury out: 195cm, 6'5"
Grimes: 193cm, 6'4"
Vlastuin: 187cm, 6'2"
Broad: 192cm, 6'3.5"
Do we bring in:
Garthwaite: 192cm, 6'3.5"
Balta: 194cm, 6'4.5"
Looking at the height, there really is not much between them, under an inch. Also looking at the height, I don't think Balta is tall enough to ruck, Nank is 199cm, Soldo 204cm and Coleman Jones 200cm - rucks are plenty tall these days.
If Garthwaite's form is good then why not. Forwards are plenty tall these days too though, Lynch is 199cm and Reiwoldt 193cm.
Of course Cox is about 3m so you just have to control the delivery into the opposition's forward line with some forwards.
DS