That's the issue, though. I'm not sure who the bigger problem was. Yifu or ngzhang. They were both seedy individuals who bashed, abused, and profited off this community. The fact that ngzhang is involved at all is no better than if Yifu was still involved, is the long-and-short of it.
The engineering team came away from Avalon with almost nothing, in stark contrast to the others. Again though, you're asking to be compensated by a totally different company. If you feel like you were wronged with gen 1 then sue Yifu's US company [Avalon]! Heck you could even sue CC if you think you have a case but it will get thrown out after 5 minutes.
You're also mixing the engineering team with 'Avalon'. These are the people that designed the chips, made the software and that's about it. They engineered, others sold / failed to deliver timely / delayed refunds etc etc. This team was doing their jobs designing Avalon2 at the time.
for prepaying them last time
They've only been selling in hand hardware for way over a year now, you might not have participated in it but Avalon2 and Avalon3 were sold from in hand in huge quantities.