I emailed Andrew Voss for Boots n' All a few years ago and said a big part of the Cowboys fall from grace was the departure of Paul Rauhihi. He disagreed. We only need to take a glance at the plethora of world class props that have powered through hitup after hitup and made the Cowboys ruck one of the most defensively dominant in this era.
Seriously though, what era would you have to go back to in order to find a less mobile prop than Shane Tronc? Maybe the lower division in England in the 1960's? The less said about the performances of guys like Kaufusi, Sargent, Cashmere and Scott the better. Carl Webb has some ability at least but I would struggle to think of someone I'd like to play alongside less.