As you said already, it is impossible to identify your fish positively as being opallios. All species of the bintan-harveyi-group, especially thos with more or less red in the unpaired fins (opallios, rubrimontis, tweediei, phoenicurus, could only be determined safely by very good, clear pictures.
But your question is: Does anything rule it out that it is opallios? And the answer is: No. On the contrary: There are some indications that it could be. The light-blue filaments of the ventrals, for instance. The faint indication of red in the back-part of the dorsal, the clear blackish marking at the outer end of the fins and the faint bluish line before: that all is characteristic of opallios. But not of it only, that’s the problem. We wait for better pictures!