You forget one factor. Most people don't realize that the early Sukhoi batches are actually gonna be due for retirement within the next decade. So the best case scenario- as the FGFA batches come in, the Su 30 we inducted in mid 1990s will be 25 years old and will be replaced. So the way to look at this might be- Jaguars, Mirage, Mig 29s which are even older are the prime replacement options for Rafale. It will not be obvious for some time since these won't be retired imedeately and the older Bisons will go out first. But eventually- LCA Mk-1 Mk2 will play role of Bisons, Rafale of the medium class and FGFA will directly replace the depleting Sukhoi fleet.