The issue is at the current pace English owners distance themselves from non-owners, even if he gets injured in 6 weeks or so. Like its game over for overall if you don't have him. Non-owners are also banking on some type of bounce back from whoever they started in place of him. Because of the extra trades in an injury scenario English owners can just swap to the best alternative and bank what is likely a substantial amount of $ for another upgrade. They're almost impregnably ahead on points and cash despite being down two trades.
Non owners are banking on an early injury: with his history it could happen, but this type of scoring could well just roll on until their bye and even past it. Notably, its not as if the other rucks aren't without injury history and most of them are dealing with their own issues (Shrek, for example, competition from Jackson for ruck time and an inept forward line he started in last weekend).
This is also, to my mind, the last week you can really do anything about it if Tim's clean run of health rolls on for some weeks.
Maybe we should just forget about "set and forget" rucks for the time being, given the extra trades we have.