Why Still Mike Brown ?

[*ochocincos*]

Remember, they are also trying to figure things out with Higgins as well.
If you give Chase a big extension while Higgins is still a Bengal, it could cause drama.

Higgins would/could feel extremely unappreciated by the Bengals and his performance could suffer from it.

Or maybe they are still trying to figure out a Higgins extension and want to prioritize that since Higgins is in a contract year whereas Chase still has 2 more years.
I know that the deadline to get a long-term deal for this year for Higgins has passed (mid-July) since he's on the tag, but they can still revisit the topic after the season is done before FA opens.