I think the most likely outcome is he stays in Indianapolis after holding out until week 1. I’d expect him to start slow for the first few weeks of the season missing training camp and preseason.
If he did get traded I could see the chiefs and chargers both being good landing spots for him in real football. Neither team has the desire to give up the capital for him or the desire to extend him
Chargers would be a net negative on the fantasy value of both him and Ekeler. Chiefs would be a dream come true for fantasy though