Forum:De-Fusion Ruling question

Alright, I'll propose my question with an example.

In your graveyard is a properly summoned Dragon Knight Draco-Equiste along with its original Fusion materials (For this example let's use Junk Warrior and Stardust Dragon)

In your hand is Monster Reborn and De-Fusion. Now if you were to summon the Dragon knight from the grave with Monster Reborn, can you still activate De-fusion on it, and summon it's fusion materials? or are you not allowed to summon the Materials because it's last form of summoning was not a Fusion Summon?