Stealing an opponent's creature, who then disconnects

I played a treachery, stealing an opponent's Marath, Will of the Wild. That person later gets disconnected, but I end up keeping Marath. Then, another opponent activates homeward path, and I still keep Marath.

https://snag.gy/sIHD5x.jpg

https://snag.gy/ofhln9.jpg

Reproduce the sequence described: steal Marath with Treachery, disconnect the original controller, then resolve another opponent's Homeward Path activation. Investigate the creature-control and disconnect handling involved, using the linked screenshots as context. Done means the creature's controller follows the intended rules after both events.

Written by the indexing model from the issue text.