I'm gonna go with what Gregg said on the Were Not Dead Podcast and compare Bricks to Lenny from Of Mice and Men. But I'll take it one step further.
My Theory is that he is going to be put into a situation that he needs to make a choice, either to watch Lizzy get needlessly hurt more or kill either Tardust or Scratch in order to save her. Effectively putting him on the outs with the Mallers.
On the run, Lizzy will invite him to come back and stay at the tower. This is when he remembers the Mallers plan to infiltrate the tower using Pippen, and it will be a race against time to get back to the tower to warn them before Pippen can raise hell.