Well that's essentially what i'm saying. If however,you choose for some reason though not to be with that person, a year or two or three etc down the track another person will come along and you will say the exact same thing about him or her.
If you do choose to be with that person for the rest of your life, then that person is compatable to you at that point and circumstance in your life.
With the benefit of hindsight, the girls i have gone out with have been so different to each other as i have developed. So my answer to your question with the benefit of hindsight is no. Had i taken the plunge with anyone of my ex's then my answer would have been yes, at that time.
See what i'm saying. Don't think of that person as a your pre-ordained or pre-determined soulmate because there is no such thing. Think of that person as the most compatable person at that point in your life. If that then satisfies your criteria to be with that person in perpetuity then so be it. It's not as romantic as thinking there is a soul mate out there for you, but it's real