Doesn't look like an Opaline to me. Just a normal green with a lot of colour in his wings. An Opaline's head markings would look like a Spangle's, and he would have almost no markings between his wings.
Looks like a normal split for opaline. Or an opaline bred normal. Sometimes normals bred from opalines can have some 'opalescence' even if they dont carry the opaline gene. This is why colour diffusion and flecking is blamed on opalines even in normal birds.
I think he is a normal green showing a lot of opalescence. This does not necessarily mean that he is split for opaline although some breeders believe it does
The cock i named 'big blue' had some opalescence on his neck and shoulders, but was clearly not an opaline. His first clutch produced one opaline female so it proves he is split for opaline.
That being said, i also have a hen that has more opalescence on her neck and a bit on her shoulders, but is clearly not an opaline (and as you know cannot be split for opaline). So it can be correctly said that birds that are NOT opaline but show some opalescence can be split for it, or could be normals (which i suspect were BRED from opalines even if they arent opalines themselves).