How did Fawkes' feathers end up in LV and HP's wands?

[davenclaw]

No: HPFGUIDX 132867

I was thinking this morning about the fact that Fawkes provided the 
feathers for both LV and HP's wands, and I began to wonder how this 
came about.  At first it seemed like a trivial matter but I soon 
realized that this has the potential for much more.

Now, according to JKR's answer to the FAQ poll question, 
Dumbledore's patronus is the Phoenix.  I think we have to conclude 
that Dumbledore came to possess Fawkes before he provided the 
feathers for the wands. I doubt that Ollivander first had access to 
Fawkes and then said "Hey Dumbledore, why don't you take this bird, 
no one seems to be matching up with the wands I made from his 
feathers."  Possible, but doubtful.

So let's say that DD gave Ollivander two feathers and asked him to 
make wands.  Did he know that the people who had good results with 
those wands would be special?  Did he ask Ollivander to let him know 
whenever anyone matched one of those wands?  Why did he use two 
different types of wood? Did Prof DD know that young Tom Riddle was 
in possession of a wand made from his phoenix?  Or did he not even 
have Fawkes at that time (which, as I said above, I doubt)?  What 
does it mean that for some 50 years the other wand sat in 
Ollivander's shop collecting dust?  Does LV know that his wand is 
made from DD's phoenix?  Does this give DD some sort of leverage 
over LV that makes him the one wizard who LV fears?

Whew.  Catching my breath.  I hope this is explored in HBP!

- davenclaw, who stupidly pre-ordered the book from Amazon and whose 
inconsiderate friend scheduled his post-wedding party for Saturday, 
meaning that he won't see the book till late Saturday night, almost 
24 hours after everyone else...