I think the story is only half truth - I believe part of the
reason is due to disagreement & dis-illusion about Arsenal
future.
Look at Henry's performance in the past seasons - after winning the
trophy in style, the Gunners are their pale self with departure of
Viera. If AW theory of selling off old stars, why did Berkamp
played so long? Surely, being the talisman that Henry is, he can
still play a role supporting Van Persie, if anything else.
Moreover, Arsenal can still sign Edurado (spelling) and Henry to
play the support striker.
Moreover, I believe Henry can still shine esp at Barcelona, they
are a team with ambition and you can bet they will bounce back with
vengance after losing this year's title to Real Madrid and they are
bubbling with stars.
it remains to be seen how long AW takes to gel this team or maybe
not too long if he decides to leave Arsenal as well for greener
pastures.