Because of how much gcds we lost too ninjutsue mathematically we get the exact same number of aeolian and armor crush as before the big changes, which is likely why SF got removed from the combo.

Personally i want to see more blade play and less ninjutsu in our rotation BUT i do think shadowfang needs to stay out of our standard combo. If i were to change just sf I would love to see its:
-dot potency nearly halved (90 down to 50 on dots)
-cooldown removed
-duration buffed to 33 seconds so every other cast can align with trick without drop off

This would remove one standard gcd from our bank (as wed be spending two on sf per minute instead of 1), keep us very close to the same dps (the drop to 50 instead pf 45 to make up for the lost gcd) and would allow us to again multi dot in multi target situations