IMHO, every nodes must be linked to the others. Or the model is very hard to manipulate and understand.
Even if it can seem buggy.
In test JavaSmaCCBlockCommentTest>>#testCommentIsAttached we say that the last comment of
void blah() {
/* the following is a declaration */
String someVar;
/* block comment at the end */
}
is contained by no-one. So how can we retrieve it.... That's very strange to me