There is a difference between Bijuu chakra and normal chakra, normal chakra can easily be given back and forth easily, however bijuu chakra requires it to be sealed within the person. Before you say "But the whole alliance was given kyuubis chakra without having it sealed in them"... Well did you ever see any single one of them use the kyuubi's techniques? Bijuudama or anything? Nope. Meaning that when someone gives another person bijuu chakra, all it does is give them an incredible amount of chakra which allows them to add more power to their attacks. While when a bijuu is sealed within a host they have the ability to use the bijuu's chakra and abilities, thus Naruto using the bijuu's chakra and their techniques. Think this is just assumption? Show me a scan of a bijuu-cloaked person (who is a non-jinchuriki) who has used a TBB or any bijuu technique. You obviously need to read the manga and actually learn what chakra is since by the looks of it you have little idea about what it is.