Two tracks not mentioned that have strong Rush vibes in places:
The Great Debate (similar vibe as Natural Science in places)
Pssst! Look at the post right above yours and the first track I listed.
Peruvian Skies (intro is straight from The Necromancer)
I can see why you'd say this. I was fortunate enough to see DT do their cover of The Necromancer live, and when they started playing it, I thought it was PSkies, but it was confusing because they had already played it at that show. Took another minute or so for me to realize what they were playing but I was blown away when I did.
With that said, I still would say PSkies sounds more like PF's Have a Cigar than The Necromancer.