Demeo was not a coward.
He was a stone cold killer but he was not allowed to engage in a war with Cuban drug dealers.
If Rosenberg hadn't been such a cowboy then Roy would never have been in that predicament.
I bet the twins were worried men as they had accompanied Chris on his wayward quest.
Agreed. He may have monumentally fucked-up and was stone-cold but going after a car loaded with what you perceive as a hit squad of professional killers with your guns a-blazing is not the act of a coward.