https://m.youtube.com/watch?v=1KsvqDDiF8M
Too many discussion. Just watch it!
From what I see, it's a matter of tactical decision as well. I think the coach placed Messi on right flank either for him to avoid the watchers or to attract them and make space in the middle.
The latter happened, but link and creativity is nowhere to be found from the middle. He was often heavily guarded by 2-4 people when no one offers a one two or going into position. I think Messi forget that it was not Barca and no don Andres or Alves or suarez or Alba to help him out.
First 45 min he still doing great, but the next 45 he was clearly exhausted which was seen in some misplaced shots and long passes and ball being robbed from him. Yeah, however great a player is, he can't do it all alone and his team mates should not think about it either. Messi needs a few argentinean in Barca for Argentina to succeed lol.