People can imagine all sorts of things, but the US already has solid evidence that Russia is behind a number of US hacks. Not only that, but the US has already said Russia is behind those attacks; it would actually harm their argument if they built a giant PR campaign around this dude, because it would call into question the previous attribution.
I can imagine this going like this:
1. They extradite this guy to the USA.
2. They indict him for hacking, try him, and find him guilty.
3. He serves 4.3 years in federal prison.
4. He is released, returns to Russia, and we never hear about him again.