Well, if nothing else it definitely seems like they're laying the ground work with Sonny for a future coke problem.
Moving on, watching this show week-to-week is like watching a (friendly) boxing match between Clarke Peters and Wendell Peirce as to who is the best goddamn actor working today. And this is without them even having a scene together yet. Both are just the perfect personifications of entrenched dignity and weary irascibility that, no matter their faults, pride, or transgressions, you can't help but root for them all the way.
In a lot of ways I see similarities between those two characters and Creighton and Davis. Lambraux and Creighton are both professionals who are proud perhaps to a fault, angry and exasperated by the failures of the system that let the city drown.
Meanwhile, both Batiste and Davis are both struggling musicians who can't make steady money, and it kills either of them to have to compromise, even a little bit, what they see as their vocation.
The difference is that, for the former (the black guys), their struggles are much more immediate, and not something they choose to take up. Both the Chief and Creighton are confronted with the insensitivity of outsiders gawking or passing judgment on their city, but whereas with Creighton he chooses to give interviews, Lambraux has to watch a very meaningful ceremony get interrupted. Crieghton at one point yells to an interview that "We're dying over here!", but he does so from the comfort of his very nice study, in his home which only lost its roof. Lambraux actually has to discovery the body of someone very close to him, in a home that, like his own, was demolished.
Likewise, in this episode, Batiste and Davis are both arrested (and have to call in Leo's character to get them out), but whereas Davis did kind of provoke his arrest, Batiste is a victim of profiling and brutality. And whereas Davis can just borrow money from his folks and others, Batiste losing his instrument means he's fucked, financially.
Apologies for the ramble, just found it interesting.