I welcome these types of articles "out there" on the web, and I compliment you for putting this together. But I think your musical examples would be clearer if you had used flats instead of sharps where they are needed. Does you music writing software not have flats?
Also, the whole idea of introducing the resolution of the tritone in the V7 chord is fine, but your later musical examples do not show this happening. If I were just learning this stuff, I would be confused as to why you introduce it and then show examples where it doesn't explicitly happen.
Finally, check the spelling of the Gb7 chord in your presentation of tritone substitutions. It think it would be better to include the root rather than leave it out and double the 5th.
I'm not trying to be critical of what you've done, but I think with a little more attention to detail, your efforts will ultimately be more valuable to your target audience. I'm happy to help out if you have any questions.