For context, Tianhang left Qwen before Qwen 2.5 over office-attendance disagreements, despite being the only Qwen team member based in Seattle at the time. I only got to know most of the Qwen researchers after Qwen 2.5. They are the people who made the team what it is today. I’ve also seen contributions from @ChujieZheng. It’s funny how people who joined later but contributed heavily are sometimes treated as too junior to comment on those who came before them. We’re living in a fast-moving era. What matters is contribution, not tenure, titles, or who happened to arrive first. Also, the first person to do something is an explorer, but not automatically a leader. I don’t care who is called the leader. I care about who is actually doing great work.