No Nagato had more than Naruto, we are talking about only Naruto chakra without Kurama chakra. Naruto doesn't have minato's chakra, that was chakra sealed in Naruto so Minato can talk to him but his chakra ran out and it gone.
No, Nagato has enough chakra to control 6 bodies who are all high jounin and kage levels. Naruto was using the chakra he took from Kurama to fight for those days, we are talking about Naruto's pure chakra that he has without any powerups from sage mode or Kurama chakra. Nagato had more chakra than Naruto.
Nope. They both are Uzumakis so yea. The little bit of chakra Minato and Kushina sealed in Naruto was nothing more than a way to talk to Naruto later on in Naruto's life and not as a powerup. Both even told Naruto their chakra was almost gone. Minato job was to reseal Naruto seal if its close to breaking while kushina job was to help Naruto control kurama's power. So Nagato has greater chakra than Naruto currently have but Naruto is only 16 so he will no doubt have the most chakra later on when/if he's older. Kurama chakra isn't counted in the comparing.
Don't be dumb, Naruto can only use rasen shuriken 2-3 times while Nagato blows up the village (more damage than 3 rasen shurikens), use lots of jutsus to kill more ninjas and fight Sage mode Naruto. He was able to hold the 8 tailed Kurama in that mini moon, and revive everyone he killed in konoha.
No lol Kisame (with Samehada) chakra was said to be close to a tailed beast and was like a 0 tailed beast. This mean kisame chakra wasn't as strong as the 1 tails chakra. The 4th Raikage chakra was also compared to tailed beast level chakra. Naruto's chakra was said to be 2x Kakashi's chakra and over 100x with kurama's chakra. So Nagato has the most, then A, then Kisame, then Naruto. Remember kisame chakra is high but he used Samehada to incresae his chakra and recover and lost chakra making it seems like he has tailed beast chakra level.