Fernando Lucas Martins bagged a brace in Beijing Guoan's victory over Shijiazhuang Ever Bright, while Tianjin Teda are still waiting for a win after 14 rounds in the 14th round of the CSL.
"A coach needs to convince players with his expertise and not by only being the boss," Baum said.
Francisco Trincao, Miralem Pjanic and Pedri will all have to wait their turn on the bench, while whether or not Dembele is included will give an indication over the French international's future.
Gianluca Caprari pulled one back for Benevento in the 34th minute, before Hakimi got his first goal for his new club in the 42nd minute.
"I really wanted to give an effort here. It's my Achilles that didn't have enough to properly heal after the Open. I was able to get it somewhat better, but just looking long-term in this tournament, will I be able to get through enough matches? For me, I don't think I could," said the three-time Roland Garros winner.
Koeman changed the style Barca used under Quique Setien, adapting a 4-2-3-1, with Antoine Griezmann leading the line, Frenkie de Jong and Sergio Busquets in the midfield holding roles and Messi, Philippe Coutinho and Ansu Fati in an attacking line of three.
Also on Saturday, Andre Villas-Boas' Marseille, still struggling for a win, was held by Metz 1-1 at home.
Angel's first goal was an overhead kick which was originally ruled out for offside, but reinstated after the referee consulted the VAR.
Tianjin rode an early 8-0 spurt to race ahead, and compiled a 25-19 advantage as the first quarter ran out.
Ronald Koeman saw his reign as Barca coach get off to a flying start on Sunday when Ansu Fati led them to an easy 4-0 win at home to Villarreal, with all four goals coming before the break.
Evergrande had secured the top place of Group A before Sunday's match, while Dalian had dropped into the Final B.