The World Cup Group Stage is set. Can Argentina do a double in a row or can Spain youngstars surprise the world?
Lol! What makes you think that Argentina can do double in a row? Literally everyone are rating Spain as the current favorite primarily due to the youngster + older combination(Yamal etc) while France along with England are right behind them.
Argentina is still heavily dependent on Messi who is in epic form these days, but I don't see them recreating another WC win especially after they barely won against France last time around.
Like you said, Messi is still in great form, but he is still in doubt to feature in the world cup. If he does feature, then you can't rule out Argentina as one of the favorites because some players like Nico Paz and Thiago Almada who are also in form would be in the team. England will always be England as they always run out of gas every time. The only outlier for them is the manager, Tuchel, who has a lot of experience.