Would you be so kind as to explain where you are seeing Se/Ni?
I don't see it myself so I'm curious.
The bulk of it comes from the whole part about planning. Kind of like what [MENTION=4945]EJCC[/MENTION] mention in the ask an ESTJ thread. Si doesn't plan 20 years ahead. That seems like much more of an Ni characteristic to me. If I plan ahead at all, it's only a few years. I can't see that far ahead of me. I don't know what obstacles the future may bring that I could be unprepared for, so my long-term plans are more of a general, loose picture than a structured 20 year plan, and even then I don't know for sure where I'll end up.
It also has to do with the Si being involuntary. The word "involuntary" makes it sound like something that you do against your will, with a negative connotation--could just be me interpreting word choice poorly. As an Si dom (which would of course be different from aux), Si is in a way "involuntary", but it isn't the word I would use since I'm interpreting it as negative... it's more like... unconscious. Constantly acting.
Never stops. It is how I perceive the world, literally all the time, like a ticking clock. It wouldn't be as extreme for an ESxJ, I don't think, since it's their auxillary--but it would still have quite a bit of weight.
Your previous quote in particular makes a good example:
I see where I want to be and then I fill in alternative pathways to get there as I move through the present.
This seems very Ni/Se to me, especially if you're seeing the where you want to be many years into the future.
As an Si-dom, if I make a plan and something unexpected happens, it's harder for me to find alternative pathways. It's more like my entire plan has come crumbling down, and it's not until the inferior Ne activates that I'm able to try and brainstorm a way through/around it. It is not something that comes naturally or easily to me. I rely on the predictable and I rely on stability and consistency when I make plans. That is the foundation. If that foundation crumbles, I am lost.