no offense but there's a thread about BLUE BIRD lyrics on the NEWS thread..
and the first part is:
"Gray" na kumo ga nagare tara
and..
kimi wa sotto ni mamotta kono se (sei) no tsubasa --> definitely correct
the "gray" word is an english word which is written down as "katana" if you found in the lyrics from the CD booklet.. (gray is one of colors)
masa123 has changed the whole lyrics not so long ago..
he found out the missing words when he watched the DOMOTO KYOUDAI show when ayu performed BLUE BIRD..and there was the subtitle in japanese..