The IAF and SU57 are now on different paths. It seems unlikely that they will ever work together. India appears to be leaning towards France, with plans to acquire Rafales and potentially participate in the FCAS program. Meanwhile, the lollypop of the MK1A, MK2, and AMCA continues. The F35 remains a possibility, but only if India feels sufficiently threatened to compromise its sovereignty. J35 competitor is nothing but Rafale and more importantly the whole A2AD environment (including AD systems) present in india. Let's hope J35 will be superior to that.