Busquets to Messi was brilliant, an assist that Dembele would never do.
Dembele is on 13 assists according to fbref. Jordi Alba is on 12, but scored once more than Dembele.
It is true that Dembele only played around half the minutes this season, but it would make sense that he'd regress to his mean when playing more minutes, last season he registered 5 assists playing 2700 minutes, the season before that 0 assists, and then 7 and 8 respectively the seasons before that.
He is on 0,34 assists per game over his Barcelona career, which is a very decent number in isolation. He is on 0,61 this season which is an outlier compared to previous seasons.
He is on 73,0% pass completion this season. Depay numbers. 77,4% over his Barcelona career.
Compare to the champions Real Madrid and no player who played more than four games are under 81% pass completion over this season. Benzema has a better assist per game this season compared to Dembeles overall number, Marcelo too, Vinicius Junior is on 0,32 so similar.
Ferrans finishing is much superior to Dembeles at least. Maybe if Dembele was able to finish as well as make good runs, Ferran Torres would be on 13 assists.