Runciman makes sense I guess given Thornley and Burgess are gone. He can cover centre and wing so gives us options in both positions if we pick up an injury in either position.
Can't see Sarg leaving if we are getting rid of Thornley I'm sure we would have made more of an effort to retain him if we were already losing Sarg.
If any if the above is true though I would hope we have a major forward or 2 signing for the pack as again we seem (if true) to be budgeting in the backs replacing 2 players with 1.