“The details of his life as described in the Gemara are widely off that of the Gospels, such that the Yeshu of the Gemara lived nearly 100 years earlier. There is a good chance that they are not the same person and it is a mistake to attribute the activities of one to the other.”
There are (at least) a couple people that went in to the legend of J. One who lived around 100 BCE (see Sotah 47a) and one who lived around 100 CE (see Horiot 5b IIRC).
In the Gemara of Sanhedrin, last chapter, a certain non-believer asked a Rabbi about the length of Bilaam’s life. The Rabbi responded 33, and the other guy said “sounds good”. One interpretation is that the other person was asking so that he could use that number for the legend that he was about to create.