This is spot-on I think.
Walt would have cared about the Gray Matter comment; Heisenberg doesn’t give a kitten. Heisenberg DOES care that the blue meth is still out there. This means Jesse is still alive, but what is WORSE is that Jesse is doing exactly what Gretchen and Elliot did all those years ago: taking credit for Walt’s genius.
This is why the two comments were juxtaposed in the same scene.
