I could definitely see them doing that. And Diana figured everything out after two conversations, so it's only a matter of time before Cane ends up getting thrown out of the family again.
That whole sequence of how she figured everything out and how Caine even found and stole the drugs in the first place was just was poor writing and a bit unbelievable. How was he going to jack the drugs from Brayden when he didn't even know that he had them in the first place
Even them adding a scene of him overlooking Brayden and Tariq putting the drugs in the trunk of would have made the storyline a bit more believable.