I agree. Hence, it is called the book of the Revelation (revealing). That said, it is an extremely problematic book to understand and interpret with a huge number of highly conflicting interpretations having been produced. It is impossible to understand literally. For example, of 1/3 of all of the stars of the universe will be literally cast to the earth, then most of the laws of astrophysics will be completely violated and the earth, which is, relatively speaking, incredibly miniscule compared to the mass of the average star, would be subsumed completely.
In regard to the topic of this thread, Revelation tends toward the concept of God reigning in heaven and receiving the adulation of all created beings in heaven. There is virtually no indication of the exercise of "free" will.
To me, the 1/3 figure is tied to a mathematical model of what's going on. Of course, you may choose the neglect as no one actually can confirm it.
By the degree of free will granted to the angels, 1/3 of them will fall at the end. It's more or less an expected outcome (in terms of mathematical statistics and probabilites) of a normal distribution of angelic behavior vs. the definition of Law. Naturally, as humans are granted with a larger degree of free will, the mathematical outcome is that less than 1/3 humans can be saved in the end. That's the mathematical representation of "we are saved through the narrow gate".
Yet another factor jammed in, "1/3 humans saved" is only under the circumstance that humans and angels have no interaction and influence. When the interaction of the more intelligent angels are taken into account, the number dropped to 0 humans can be saved. Satan and his angels (they are much more intelligent than humans), by their free will, will make sure that all humans will fall, that ties to the concept of total depravity.
That is, without interaction between angels and humans,
- 2/3 angels can pass the judgment of Law to enter Heaven
- less than 1/3 humans can pass the judgment of Law to Heaven
Then with interaction,
- 2/3 angels can pass the judgment of Law to enter Heaven
- 0 human can pass the judgment of law to enter Heaven
With Jesus then,
- 2/3 angels can pass the judgment of Law to enter Heaven
- 0 humans can pass the judgment of Law to enter Heaven, however less than 1/3 humans can pass the judgment of
Covenant to enter Heaven (as God's Grace through Jesus Christ, through the same narrow gate though).
I believe that this is rather the mathematical model behind the scene, based on the "1/3" figure ("1/3 angel" is not my invention but rather a widely spread conception) hinted in the book of Revelation.