Brent wouldn't end up sleeping in Aunt Dina's unit. This was partially because the others were worried about her being alone with Brent, and also because of Brent's warning.
If Brent disappeared from her apartment? There was no telling what Aunt Dina would do to the city. Brent wouldn't even be able to scold her for her actions either, since he would have been the one who disappeared. She'd managed to keep most of her sanity after her lover was killed. Brent did not want to be the reason she got pushed over the edge.
The other reason was her windows weren't as covered as she would have liked. That was why Xavier and Esper Parker had been on the phone. Their teams had been working on several apartments below to get them ready.
Brent was going to move between all of them with different Espers sleeping nearby to respond in a heartbeat. Brent was now a very, very important person to them. Especially if he now held the James family by the balls.
