>>539769431
The point from there is what 06 did with having Amy be the third character for Silver & Blaze.

Using Marine as an alternative is basically a reskin of that, since Marine is largely just another Amy despite being "Nega-Tails".

My train of thought at first when writing that post was "if Sonic/Silver is the lead guy here, and Blaze is his polar-opposite, who would be the third be in this binary-system?", but then I realized that Blaze herself is opposite to Amy. In a similar way, at least, to Knuckles being Sonic's Rival but often being grouped in alongside Tails.

If Knuckles, then Tails
If Blaze, then Amy

So, if Silver is with Blaze, then the third should be Amy, who is also opposite to Blaze through her link back to Sonic. But logically, Amy has Team Rose. But, Blaze has her own discount Amy as a result of trying to give Blaze a discount Tails, and Amy is basically a Nega-Tails, so we get Marine.

So the logical third candidate for Silver & Blaze is Marine.