With a guy like Ingram, the Kings would presumably be imagining a considerably more optimized version of him rather than what we've seen from Ingram the last few seasons. You'd be betting on Ingram evolving as he steps into the next phase of his NBA career. Perhaps that's just blue sky thinking, but we've seen it happen to several Kings since they began playing for Mike Brown. Domas evolved into the entire fulcrum of the Kings' offense once Brown got his hands on him. Fox evolved into a capable volume shooter under Brown. Monk evolved into a legit playmaker under Brown. Keegan has evolved dramatically under Brown from what he was known for in college.
That said, I'm not super high on Ingram as a trade target. His injury history is what concerns me most, and I certainly don't love the notion of Ingram on a max contract if that's what it would take to keep him beyond next season. But he's still only 26 years old, the talent is obvious, and the fit seems like it could be massaged with a bit of creativity. I don't have to squint too hard to see how Ingram would elevate this Kings team, especially if they don't have to surrender any of their core to complete the deal.