You're doing fine. The main players all have distinct personalities. Barbra and Jon are probably the weakest -- Barbra because she doesn't have a lot of air time, and Jon... I don't know. He's there, but he's not central enough to get a good feel for his character. It is distinct from the rest, though -- just a bit more opaque. Gunter is another one who could probably do with more play so we can see his personality more -- but as the security guy, strong and silent works really well. It would be interesting to know what he thinks of Chase and Brandon, but he's professional enough we may never get to see it.
As for the minor players, Steve and Wilde are developing nicely. Zeke is, again, more of a background character, but he's still standing as a unique character.
In the second thread, all three major characters are well developed.