DiMaria is more of a player that likes to work in the back rather then being in the frontlines. That's why he was having a lot of trouble. And Messi was worrying too much about making a statement and took everything in his sholders.
A right winger plays as an attacking midfielder likes to work in the back? He did what was required of him, he was all over the pitch covering both ends. Just some awful touches here and there, and lost a bit of possession.
Messi isn't surrounded by Xavi, Ineista at national team, of course he has to do a lot of work by himself. Usually at Barca, its some fancy 1 2 then goal right after, he's way too comfortable with that system Pep developed.
Argentina is showing weakness in possession and that is caused by a somewhat unimaginative midfield. BiH's first half pressure not only threw them off balance, but also exposed just how unstable that final four can be.