Nah, he never could, it was just the heartless making the decision to follow on it's own. Occasionally Bray goes rogue, happens to prefer being in the presence of girls. Probably would've watched over Cal when Trace and Vi went to the mansion if he didn't give him a command before then. Beyond that, Trace can't understand or translate what his heartless is thinking anymore than Cal can with Sparks .
Trace will get there in due time, theres this synergy thats being expanded on between the heartless and human when either one goes postal, the other is usually the calm one in those situations. Here in particular, I can probably see Anti doing something to interfere. The Jerk doesn't want him to have fun apparently!
He hit the ground at about two meters from where Nana is standing, thats about the length an average house door if you layed it flat on the ground and stood at both ends of it. It was a precaution for sparky, and an initiation of aggression towards Nana who's trying to talk, despite ignoring what Trace said before xD.
Yeah, Nana is of the same opinion but he’s also willing to carry out Ichi’s orders (the oldest of the siblings), so yeah it’s fun and leaves him conflicted when those two desires counter each other. It’s to avoid that conflict why he usually stalks people, so he’s actually taking a huge risk right now (I think he confides this in Cal after she gives him a name).