Jeremy Tilse to start is a real surprise, particularly as it means Ryan will drop out of the 22. I suspect that he will get half a game and then Robinson will come on, Perhaps he will do the last 15 mins as THP so that Kepu can go flat out for the first 65 mins (the Al Baxter strategy, first introduced by Ewan McKenzie, I think). It will give the QLD THP nightmares with Benny coming on fresh and mad as hell. Watch out for the first scrum after he arrives.
Jeremy is an interesting case. He is only 26, started in the squad as an 18 year old. Props are at their best in the 27-32 age bracket, so he is just coming into his prime. The next five years for the Tahs could be a front row golden age, particularly as I think we'll be going to squads of 23 next year.
This might also be a start of a prop rotation program like they have in France. Say Kepu sits out next week with Benny and Ryan starting, with Tilse on the bench (Rebels scrum is not that hot) and then Ben and Kepu to start against the Brumbies with Tlse on the bench against the Show Ponies. Works for me and the Crusaders did it all year last year, albeit with three rotating rather than four.