Commendation Crystals and Augmented Hellhound weapons

[RyanCousland]

I have one other question regarding the reward, where i need confirmation for.

Do i get the rewards (including commendation crystals) for highest achieved rank or based on my rank at the end of the season?

I heard that it was based on highest rank: Can anyone confirm this?
Or is there maybe someone who deranked from Crystal/Dia to Plat and can confirm that you still get the commendation crystals?

its highest rank achieved