Without reading the chapter...
the three types of awakening are
1 - Sammasambuddha
3 - Paccityabuddha (sp?)
the first two teach, the last does not, for the same reason the Present sammasambuddha almost didn't teach, because he saw it as to difficult due to the profound nature of what he had realised.
The seconds teachings do not last a long time if I remember correctly as they do not teach as thoroughly as the first, by the third generation (just a number off the top of my head not from a teaching I heard specifically) after they die the dispensation is dead also.
They are all equally enlightened, and by themselves, they are equally different to an Arahant disciple in this way, but they are not all skilled in teaching, or have the inclination to do so.
this is from memory and I may have the names for them wrong, and finer details.
He who knows only his own side of the case knows little of that. His reasons may be good, and no one may have been able to refute them.
But if he is equally unable to refute the reasons on the opposite side, if he does not so much as know what they are, he has no ground for preferring either opinion …
He must be able to hear them from persons who actually believe them … he must know them in their most plausible and persuasive form.