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This looks like a comparison between both players, Vini and Mbappe are both quality players with different abilities that totally distinguish them from each other. Mbappe is good but not better than Vini right now, his abilities doesn't stand him a chance against Vinicius who has been an important figure in the club, if Mbappe was so better, he should have been benching Vini from playing the left wing which is where he played from in former league.
Not forgetting that three of Mbappe goals this season are coming from penalties shoot out, that may not still change your opinion but knowing that Vini is more of a threat on the ball facing defenders compared to Mbappe and clearly up to the level of competing with his level of nvolvement in the whole squad right now.
Benching Vinicius Junior has never been part of the plan. How stupid would Ancelotti be to bench one of the two players once Real Madrid was able to get them under the same roof? That is big nonsense.
The goal is to find the best place for Mbappe. I was never sure whether he should play the central striker position. He prefers to play on the wings and then use his speed to cross into the middle while Vinicius Junior often prefers to stay on the wing. This is a small issue, but before he would bench of the two players, Ancelotti would let one of them play in the center and this would be Mbappe.
Now saying that Mbappe doesn't stand a chance against Vinicius Junior couldn't be further from the truth. You might be talking about the status quo in Real Madrid, but as soon as Mbappe reaches his full potential, I think it would be the other way around and Vinicius Junior wouldn't stand a chance against Mbappe in terms of scoring goals.
But the comparison lacks to some degree as Vinicius Junior isn't quite the goal scorer like Mbappe. He is someone who focuses more on bringing confusion into the opponent's defense, give an assist and at times finish himself.