Predator drop to Diamond in arena ranked

@CaptainDJJ I don't speak from experience, but found this quote from the EA article introducing Ranked Arenas

"This also means that in Ranked Arenas there’s no demotion protection—you can demote a ranked tier, going from Plat IV to Gold I after a loss, for example. Don’t worry though, you will still get rewards at the end of the season based on your highest tier reached."

From this statement (unless it has changed since then), it would appear that you will receive the rewards for your highest rank achieved during the season, so you should get rewards for Predator tier