Why Tanjiro really love his father very much?

If I want to start reading the manga of Nanatsu no Taizai by the chapter season 4 of the anime start (so I can get spoilers of what's going to happen in this season of the anime), which chapter should I start reading the manga?

I mean, yeah I would like to listen to Naruto's speeches and his 5000 flashbacks with that swing in front of the Academy, but does the villain want to listen also? They wait for the characters to stop talking or planning or whatever to attack. I don't really get it from the villain's viewpoint be...

After finding out about Megiculas curse on Lolopechka, I am still very surprised that Asta never tried to nullify it with anti-magic. After all, curses are just spells with lingering effects and its been shown that the demon destroyer blade that Asta possesses, is capable of absorbing and nullify...

As far as I know the original voice actor of Hattori Zenzou has died, so who is his voice actor in Gintama The Final and who is going to be in the 2 episodes of The Semi-final?