Hogwarts’s Affectionate and Righteous Slytherin

The author started writing in 1970. At this time, Voldemort had already made four Horcruxes: a diary, a ring, a crown, and a gold cup. The soul was not particularly unstable.

In the original book, at this time, he was still trying to win over his supporters. Knowing the canvassing, his brain must be normal. He didn't have the violence after the resurrection.

Bellatrix was accused of marrying Rodolphus Lestrange, and it is speculated here that it was to make the Lestrange family stand in line.