I don't know that you understand what I am saying. I would agree that the tendency is more for the 7th to resolve downward, but, and you can play this on a piano/bass/guitar if you like, if the 7th moves upward to the 5th of the tonic does it still resolve? I would argue that it does. The leading tone on the other hand can't go anywhere else and still resolve the dominant.
No, in the case cited above it does not resolve, or resolves deceptively.
So what I am saying is that what the 7th of the chord does is irrelevant in term of directing resolution back to the tonal centre. Even if I am in the minority I would like to see a stronger empirical argument against what I am saying than what everyone else thinks is right, if possible.
Even if the "everyone else" in the above statement includes the greatest tonal composers the human race has ever known, and whose broad shoulders we all stand on, harmonically speaking? The "empirical argument" can be found in the music of Bach, Haydn, Mozart, Beethoven, Brahms, Schubert, Mendelssohn, etc. Their 7ths resolved down. Look at the music, and if you'd like to pursue this point, please cite examples where their 7ths resolved up to the 5th. This simple empirical fact tells me that what the 7th does is far from irrelevant. If it were irrelevant, the greatest composers in the history of western music would not have treated them as consistently as they did. The music bears this out. You are free to argue that their opinion isn't worth any more than yours on the subject, but I'm also free to point out that when trying to determine the answers to questions such as this, it is wise to consider your sources.