The problem is - you are not bypassing oppo preamp. Essentially XSP-1 would be used as an analog volume control only. I am not sure why this configuration will be much better unless you prefer some emotiva sound coloration in your system
If he went into the Emotiva via analog outputs of the Oppo he would be bypassing the Oppo volume circuit. He may find he likes the Emotiva more for this. I like the sound thru my JC2 more than the Oppo connected directly to my amps.