Maybe I don't do subtle very well. I don't think about what movement I am making, I move and my partner moves I am not even sure who moves first (except at the start of a track or a very definite stop). My partner may not always move in the way I expect but so long as she moves in a manner that is consistant with her feelings I can adjust accordingly. Really all I want is for the follower to go with her feelings and then I can fill in around her. Just to sound a bit more confused (which I am not though) I am not even sure what these feelings are or where they come from. I have a suspicion they come from the music and our interreaction but how it all works I have no idea.
I appreciate that BR is your turf so to speak but I feel that there is far less room for follower options in BR than in AT. I don't think we should stray to far into this area though otherwise the mods will be onto us.
I suppose the common ground between us would be that we would hope to make our movements unconscious, as our skill developed. If I'm going to step forward, I don't lead the step by moving my foot. The actual movements are difficult to describe, because some of them are subtle, and much depends on the context; but it almost amounts to the body 'breathing in' and gathering its forces (which might include a slight lift in the torso, forwards and upwards from the standing foot). This 'gathering' movement is hopefully communicated to the follower through the connection, and she responds, by initiating a matching movement.
If I was walking to music with a clear, definite beat, on the beats (so a series of 'slow' counts - not that I'm counting), then the movement's origin is roughly on the mid-point of the preceding beat, so that my whole movement could be counted &1 &2 &3... This corresponds nicely with the idea of collecting between steps, so that we are 'in neutral' at the point that I 'gather myself' to start the next movement, which may be in a different direction, or otherwise be not completely obvious.
If the action required is to lead a pivot, to achieve a change of direction, then I'm even earlier, because I want the follower to feel my torso rotation as she collects from the preceding step, so that if I intend the next step on the next beat, she has time to pivot and still step on time. Always, I strive to be clear, and to try and cut out other body 'noise' so that the signal I communicate is the signal I want to have received. Often, of course, I fail, or am tired, or have to change my mind at the last moment because of a floorcraft issue. But for the most part, I feel that there is plenty of time for this process, and that having to actually hold back a movement, for the sake of more time to lead it is not on the adgenda. As other have said, the lead has just died then, and I wouldn't be happy, as follower, with that sort of lead.
As for the BR point, I don't want to persue it (it was only an aside), but you would be suprised, perhaps, just how wide are the options, once a certain level of proficiency has been reached. The lead process is very transferrable.