OPPO was direct connected to the DENON with a single HDMI cable.
But since the DENON HDMIs are failing, now I have the OPPO and the rest of players connected to HDMI inputs of an HDFury Vertex2. The Vertex2 HDMI video outputs to Projector and TV, and the Vertex2 HDMI audio output to a DENON HDMI input that still works.
This connections cause even more HDMI sync delay, due to the always HDMI handshake of the Vertex2 when changing files during playback. And with this connections I don't hear any noticeable loss at the beginning of the songs of this XTC-SKYLARKING Blu-ray.