Changeling Hypothesis: Is it flawed?

[charme]

No: HPFGUIDX 112547

I have been reading Mugglenet and RedHen's essays on the Changeling
Hypothesis, and I'm wondering if anyone else has at least a question about a
statement in canon made by TR in CoS as it relates to these theories.
Specifically, Tom tells Harry in the Chamber that he began to pour a little
of his soul into Ginny.  Much is made of Harry having 2 souls in the
Changeling Hypothesis, and I'm wondering why this canon is excluded from
those theories; I'm thinking that Harry only has a *piece* of TR's soul, and
questioning  if there could possibly be other pieces out there in the WW?
We know that TR/LV was experimenting with ways to avoid death....that's not
to say Harry doesn't have a substantial piece, but what does Ginny have?
Who or what else has one? If TR is just a memory in a diary, how can he
"pour a little" of a soul he doesn't have into Ginny?

Very confusing - all comments welcome to put me out of my confusion
nightmare.  This one confounds me more than TT, if you can believe that...

charme