Or: you finish that bit.
That's an excellent point in say Stickleback the reveal of him being S.H. could have been an end point, which opened doors, but wrapped things up for now, if used differently than it was.
GRennie is also very good at giving a series a sense of direction and ending, even if we don't know how long it will take to get there. Well forgiving him that dangling plot thread in Callballisitics Inc!
We know where Aquila is going, we have a sense of what the end point while be and its getting close, but has been building to this point form the off.
We know were Jaegir is going and that actually feels pretty close too.
We had a real sense of where Absalom was headed all the way through that.
He presents a central idea that drive the protagonist through the story. Its often open enough that he's not tieing himself to a specific path and can meander and explore as the muse takes him. Heck I guess he can spin the wheel and take us down an surprise track if he choose But his stories feel like they are progressing to a point.
Brass Sun feels like it should have that as well, with its central quest, but much as I adore the series, never really feels like its driving towards that ending with any conviction. I'm sure it will get there just as Red Seas did in the end.