On the Subject of Simplifying Simon States

Who is this mysterious man Simon, and what exactly is he stating?

Note: For use by those familiar with the original manual. Contact Nanthelas on Discord with any corrections.

Red	Red	Blue	Green	Yellow
Yellow	Blue	Yellow	Red	Green
Green	Green	Red	Yellow	Blue
Blue	Yellow	Green	Blue	Red

Stage	Flashing	Instructions
1	1	Press flashing color
	2	If Blue, press highest priority that flashed Else, press Blue
	3	If Red, press lowest priority that flashed Else, press Red
	4	Press 2nd highest priority
2	1	If Blue, press Yellow Else, press Blue
	2	If Red and Blue, press highest of Green/Yellow Else, press lowest priority that didn't flash
	3	Press color that didn't flash
	4	Press same as Stage 1
3	1	Press flashing color
	2	If both pressed, press lowest priority of other two Else, press same as Stage 1
	3	Press highest priority that flashed AND hasn't been pressed
	4	Press 3rd highest priority
4	ANY	If 3 distinct have been pressed, press the remaining color
	1	Press flashing color
	2	Press Green
	3	If exactly one flashing hasn't been pressed, press it Else, press lowest priority
	4	Press lowest priority