I can imagine the Russians being willing to quickly whitewash a report and risk cosmonauts, which is a way of saving the ISS - even if nobody else will send anyone.
But then it could all get political and weird. With say the Russians refusing to go without anyone else. Or mocking everyone else, and then other space agencies feeling pressured into relaxing their safety rules, or other grumpiness.
Of course it could be a genuinely easy mistake to diagnose. Most of their other problems seem to have been with the Freigat upper stage, which isn't used on manned Soyuz launches. But equally that could just be luck, as quality control has clearly been suffering of late.