It's clear that "No matter where you go, there you are" has some significance we just don't know yet. My aim with this is to ask if perhaps part of the mystery lies in some of the instances in which "there you are" is used has added significance in a return to some of these instances. Grave Peril being a prime candidate for Harry to return to in some capacity. I'd argue Changes as being another instance, not to mention Harry's take down of HWWB when he was just 16 years old.
So, Id Harry tells Harry "No matter where you go, there you are."
Uriel tells Harry the same thing "No matter where you go, there you are." This was something Uriel considered useful for Harry to know, though Harry was totally clueless as to what it meant.
Reviewing some of the instances' I'd say Mrs. Spunklecrief had a hidden conversation with another Harry that was present and overlayed on top of Harry in Changes.
Harry returns to some of the events in Grave Peril. He returns in some capacity to Changes.
Some futuristic Harry assisted a younger self in the flashback to Harry vs. HWWB. Alternatively, a Archangel whispered words into the ears of a young Harry to help him defeat HWWB.
i find it somewhat significant yes. The most direct translation that I've come upon, is nomatter the events leading up a thing YOU were always going to find yourself their by perview of your choices, of who you are. (Something cluebatted at, Harry finding himself. Saw a really excellent thread on it just the other day...) the summation of the parts were always going to equal the same whole. Harry is always going to be Harry, it's who he is, literally.
Could have some significance through Harry finding himself, recovering who he is, coming to be in this own place in time, ect. Something I think will be touched upon in the MM book.
But I can't figure out the significance of the other view points of finding him for sure.
"If a group of people stood surrounding a large house with thick brush on one side, trees on another, ect, and you asked all these people to describe the house, they'd all say something different, but not untrue. Because of the different perspectives each view presented something totally different. But not one of these people, even if they pool their information would know what the house is for sure. Because? Not one of them had gone up to the house, gone inside and explored not only the interior, but the materials, the design, the very foundation of what makes it stand." (This means taking pieces of it apart of course, change, the observer effect applied)
This is the difference between all those who 'find' Harry with 'there you are' and Harry finding himself.
The house of Harry stands as it is because Harry observed it standing there, of that design, with those materials, with those principles as the foundation. But perhaps the house was designed to stand that way from the beginning of it, and Harry had to observe its construction anyway?