ITCHY EYEBALLS
I see you watching me watching you
I should clarify my post.K
Kemp (like Arrow has indicated) has attributes that suit forward 3rd tall. Namely Kemp is less great marking body on body. But very good in the clear or with a run and jump. That alone makes you think he could make a decent third tall forward as that role requires you to get up and down the ground leading away from your direct opponent. He has more speed than JSoS surely so another tick. Don't know about repeat running.
Despite all that, we have TDK, Kennedy and E Hollands that can all slot into that more physical 3rd tall forward role. Obv with Hollands its more just about quality of player rather than being considered a third tall.
I think they play one of those 3 in JSoS's role. It's also testament to JSoS who a lot mark down on this forum. He holds out those type of players from the third tall spot because of what he offers the team.
I think TDK should be #1 ruck, so was referring to Kemp in the fwd/2nd ruck role that JSOS has played.