Gru is very forgiving of Maxine for the events in DM4.
You mean to tell me dude threatened your family, kidnapped your biological child, and did potential irreversible damage, and proceeded to say all things are good after singing together in a villain prison?
Either they really ARE close friends, or Gru really doesn’t care what happens as long as no one is murdered. Which tbh doesn’t add up cause when Vector and Brett almost murdered the girls in 1 and 3 he was really out for blood.