Argentina team is full of great talents that can make big difference in their team.
Argentina has very important players injured, not only Messi, they also have Lautaro Martinez who is injured
https://buenosairesherald.com/sports/football/argentina/lautaro-martinez-to-miss-argentina-double-header-with-injuryThis means that Argentina's attack will be weak against Brazil. Argentina's great luck is that Brazil is not a strong team at the moment. It is an unstable team that can win or draw. Since Argentina is well positioned in the table, a loss or draw will not harm Argentina. But I don't see Argentina's game against Brazil as being a very incredible game. Both teams have not played well in my opinion.
Let's not underestimate Brazilian players so much because they have been title holders in this league also and should be a force to reckon with this season although Argentina has more skilled players that could deliver goals for their team more than the Brazilian team with the current numbers of injuries in the Brazilian squad it becomes almost hard for them to be equal to Brazil in this season despite their current records.