I think you're trying to read too much into it.
JKR just wanted to introduce some main characters, especially Hagrid.
This set up his dramatic appearance on the Dursley's rock by the sea.
I think it was just for fun, just for the drama of it all.

But now that you mention it, I might have another look at that first chapter.
Some throw-away line might give a clue. It did mention young Sirius.
Maybe Diggle will be important, or someone or something casually mentioned.
The lemon drop, Dumbledore's watch, the scar on his knee?
Or maybe she'll just close the last book with more shooting stars in Kent.