To be fair, reading through the whole of that Saunders piece, it appears he's now got the condition under control & his platelet count into the "normal" range, so I'd guess it's more a case of monitoring his condition & adjusting his workload in the same way that Slade has to manage his diabetes. There's no reason that while Saunders' platelet count stays at a nominally typical number that he can't play a typical workload of rugby games for a Scrum Half.