Past Imperative

Or actually, maybe not so strange if you look at it from a purely practical perspective. Bagoas was effectively spoils of war, like everything else that Alexander won. He came along with the rest of Darius' stuff - Darius' palaces, Darius' tent, Darius' horses and chariot, Darius' cloak, Darius' bloody family, hell, Darius' empire for that matter. Just because a thing had belonged to another master in the past doesn't mean he's not going to use it. He slept in the palaces and the big flash tent after all, and I'll wager he rode the horses and had the slaves and servants go about their tasks as usual. Why should Bagoas be any different? He's a trained pleasure slave after all, a dancing boy ... what else is he for, if not that? If Alexander found that he had a fondness for the boy as well as a use, fair enough - but let's keep it in perspective, yes?

As for how clever Bagoas was, I'd have to say that seeing as how he survived in a Persian Royal Court and managed to get from one Great King's bed to another without falling prey to the manipulations or intrigues of those around him, he probably had his head screwed on well enough. That, and good survival instincts.