Unlike ShadowMeshDraw, a skinned caster carries no world-space bounds: a bare ModelMeshPart has no parent reference, so the part's ModelMesh.BoundingSphere isn't reachable at collection time. Skinned casters are therefore drawn unconditionally (no per-light frustum cull) — correct for the sample's single animated character; the per-caster cull only matters at scale for instanced terrain.