Digest warpless is the most fucked up category I've ever seen. Most of the levels are skipped for no apparent reason. Below is a list of stages that aren't skipped:

World 1: 1-1, 1-3, 1-4, 1-7
World 2: 2-1, 2-5, 2-6
World 3: 3-2
World 4: 4-6

Digest warpless seems to be significantly faster than normal with warps. A ridiculous amount of stages aren't played in this difficulty. Might be worth testing normal level exit after warping in digest to see where it leads.

Addendum:
-2-6 lacks the enemy used to skip dragon wings, significantly slower than normal difficulty as a result.
-Afterimages from 2-6 can be used to both reach the end of 3-2 and get early dragon wings in 4-6.
-1-1 is still the most inconsistent stage in the game.

More stuff later