I don't see any conflict between Vinicius Jr. and Mbappe. They were acting really friendly with each other. Mbappe assisted for the goal scored by Vinicius. Oviedo is a really weak team and AFAIK, Oviedo is having financial difficulties as well. Real Madrid would probably have big problems against all the stronger opponents in the La Liga. I didn't watch Barcelona's performance against Levante, but their victory was achieved after serious resistance coming from Levante.
I can't believe that Atletico Madrid would ever sack Simeone. This is just clickbait and gossips.
The team from Madrid is a total favorite for winning the match versus Alaves before facing Villarreal in September.
Why should there be a conflict between them? They play on the same team, they have the same goal, to score as many goals as possible, and they both play in the attacking line, so it’s natural that they would get along, score goals together, and have a good relationship. Vinicius had complaints to Real Madrid management about Mbappé earning a higher salary than him. Perhaps there isn’t really a conflict at all, and the media just hyped it up for headlines.
As far as I know, Vinicius was informed that Real is currently unable to raise his salary, so everything will stay as it is. Apparently, he is fine with this for now, since he continues to play, and in any case, he is still earning a good salary. I don’t think missing out on a few million per year would make him feel significantly worse playing for Real.