Most of our great rucks of the past wouldn't make it as ruckmen nowdays:
Dyer 185cm 89kg
Wright 188cm 102kg
Morris 188cm 86kg
Bentley 183cm 87kg
Green 193cm 94kg
Mark Lee is probably the only one who is around modern day ruck height at 199cm and even then he is at the lower end these days.
As for KPPs Titus was as tall as Jake King and Vic Thorp as tall as Axel
. Swift was 183cm so as big as Newy.
We still need more class and depth so imagine adding Stewart, KB & Rioli to Dusty, Cotch and co. in the midfield. Who needs a backline then!