Fawkes

[Dalriada]

No: HPFGUIDX 89131

Like other posters, I've also been thinking about Fawkes' role in 
the books but I have different questions. I've used the infamously 
inaccurate Yahoo search, looked through "Fantastic Posts" and the HP 
Lexicon but can't find the exact answers I'm looking for. Hopefully, 
someone in our group can point me in the right direction. 
After re-reading GoF, my questions are specifically about phoenix 
feathers. I'd like to know:
*When did Fawkes drop the feathers that were used in LV and HP's 
wands? Did Fawkes leave one feather back in the 30s for the wand of 
Tom Riddle then drop another later? Or, were both dropped at the 
same time, the "brother wands" created then, one given to Tom and 
the other kept in storage for the right owner?
*According to the Lexicon, Fawkes came with the office when 
Dumbledore became Headmaster. When did DD know his bird gave the 
feather for LV's wand and did he know there was a brother wand out 
there? If the second wand was created later (perhaps after the 
prophecy) did DD order Ollivander to keep the wand until the boy 
named in the prophecy came along?
*Speaking of Ollivander, how does he come into possession of these 
specific feathers? 

I don't know if there are answers to these questions. Forgive me if 
they've all been asked before. Truth be told, I joined HPfGU a 
little while ago but I'm a lurker who checks the messages only 
periodically. Any info would be much appreciated.
Many thanks,
Dally