Tony blaming Luca is a heelish way of not taking the blame for his short comings but as a boss that's his right. But Luca saying it's the first time making a decision on his own, that's wrong creative , he has to make them without the boss that's part of being a consiglere job as third highest ranking and the advisor of the Mafia.
I like how good stacks is. The way he just moved in time without getting hit of Luca and Then Luca hit Tony, his timing was impeccable.