Trying to snap a frame made me realise you probably cant really tell unless they were side by side.. ur right though they arent that different in dimensions, its that explosiveness in movement that seems really different..
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I just looked him up, Egan actually only 19 (turns 20 in september, or so some random website says), so hes younger than I realised.. he could have played SG Ball if they had wanted him too.... I just cant imagine he gets any slimmer or faster from here though.. surely he just gets 'huge' as he grows into his 20s with more pre-seasons, surely hes a prop within a few years? With his work ethic and skill to have played 2nd row this long, hes a chance of making it in 1st grade for sure.. its a very lightweight mobile pack though with couchmans, egan etc.. anyway its all very interesting.. probably by the time MMolo is gone, he's ready to be the backup first-grader.
Halangahu might take a similar path into the middle.. but he's a different cat.. and again too early to be sure.. Dave Fifita shows a big bloke can play 2nd row.. but u gotta be able to run over/thru/under tacklers too.