I'm not interesting in absolute certainty.
It was just the thread of discussion. There's no absolute certainty with anything. Note even science, but there are levels of certainty. Some things are more than others.
Josephus himself doesn't support the existence of Jesus, but I do believe that the fact that there were Christians does. That there was a group claiming to follow a Jesus means that there was some kind of leader at some point. It's very rare to have leaders who works as proxies or using the "salesman from out of town" cons. It happens, but rarely, so I think it's leaning more towards some kind of "Jesus" leader.
Agree. That's why I don't take Josephus as the essential point to why there might have been an historical Jesus. It's rather the compilation of things and the inference of it.