>>Your Oppo won't pass SACD over optical or coax because (theoretically) optical and coax don't have the bandwidth to support that.

... and even if they did, your player would not be allowed to use those digital links because they are not protected. DenonLink is protected (encrypted) so Denon is allowed to output SACD and DVD-A over *their* digital link.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8