That one was iffy. He will be going into the last year of his contract and blasted the org. If he has not been traded they might not protect him. Better off trading him though.
The real expansion draft isn't until the summer of 2021, And Luke Glendening is a UFA then and most likely out of Detroit. So the odds of Seattle getting Glendening from Detroit are nil. My bet is that it'll be Danny DeKeyser or possibly Justin Abdelkader with a sweetner from Yzerman.