These days, when Asami looks out of the window at night, he wonders where Takaba is. If Takaba's safe, out there.
He's got people discretely watching Takaba's apartment, of course; he'd be a fool not to, but Takaba's made it a game to try and avoid them (since unlike Asami, Takaba is a fool) and so Asami can never be entirely sure of anything they report to him.
Forcing Takaba to be sensible and move in with him would be much more convenient. Takaba would make a fuss, no doubt, but Takaba makes a fuss about nearly everything Asami does.