If the Kyuubi can't escape until Naruto dies, and he doesn't want Naruto to die, that is quite the royal conundrum. The only thing that would work at that point is Kyuubi convincing Naruto to undo the seal himself (highly improbable that this will work) or Kyuubi convincing Naruto to convince someone else to do it (more improbable and confusing). If this hasn't already been stated, I believe the Kyuubi helps to heal Naruto because it is beneficial to the Kyuubi's own existence. That being said I'm also assuming that the Kyuubi is conscious of helping Naruto, like during the Sasuke vs Naruto fight. Of course part of what I've just said can be negated by the fact that Kyuubi's powers are slowly killing Naruto.

Anyway, I wouldn't go as far as to say the old Garaa's fighting style was comparable to Naruto's, though yes I do see your point.