So if I do not use the term “devotional”, I could repost Oswald Chambers and invite discussion?
If you are using the same source then (a) it is a duplication and (b) it is a devotional.
But if you are using another source for Oswald Chambers' material, then yes, it can be reposted as an "open" thread.
Or perhaps, for a Devotional thread you would like to have discussion on or have Open, you could start a separate thread for discussion of the Devotional? Just a thought.