What Horn likes is that Downey, even at his size, can be self-sufficient when he needs to be in those crucial possessions.
Meaning, many other players — high-scoring players — lean heavily on others around them to sustain their level of play. They need someone to pass it to them. They need someone to draw the defense. They need someone to be a second scorer.
To use a baseball analogy, it’s like a power hitter needing protection in the lineup to see better pitches. Downey’s currently playing without a safety net, making it all the more impressive.