Disclaimer : I don't know what is in the mentor.
But I don't see how stuff with moving diagrams could be superior to stuff with unmoving diagrams, if filled properly.
Are there some ideas that chess mentor cannot cover
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What is "dense stuff"?
Some chess books have pretty dense stuff that isn't just about forks and pins which chess mentor will have an easy job ingraining into students. Can it all be covered or will chess mentor only partially replace a full chess library