Dutch Flat Mates (Dutch Whispers): Another Exception Flat Mate Sudoku

Today's Puzzle:

Continuing the lovely series of Dutch Flat Mates from Flinty & occasionally Good City.

This puzzle has a phenomenal break-in that allows you to place a lot of digits quickly!

Link to Play Along:

Dutch Flat Mates (Dutch Whispers) by Flinty http://tinyurl.com/SudokuSleuthDutchFlatMateWhisp Rules:

5's live in Dutch Flats All 5's in the grid must strictly have EITHER; a '1' directly above it AND/OR a '9' directly below it. It may have both, but it doesn't need both. Examples provided below on an empty grid.

Dutch Whispers Adjacent digits along an orange line must differ by at least 4.