No, it's not. Mozilla has 750 employees (not all of whom work on the browser, but still) and hundreds of millions of dollars and they're constantly struggling to keep up with Chrome. 9 part-time devs cannot do this.
We're talking about different things. I'm sure the LibreWolf team could develop a browser that meets some specifications and renders some websites some of the time. What they can't build is a Chrome competitor. It would become an often-broken hobby project only used by enthusiasts, like the others you've listed.
Otter and qutebrowser are based on QtWebEngine which is a wrapper around Blink (Chromium's engine), Min is using Electron which is also a wrapper around Blink, surf uses WebKitGTK which is a wrapper around WebKit (Safari's engine) and Bromite actually says is a Chromium's fork. The contributors for those browsers have to only maintain the GUI which is just the tip of the iceberg. As for Links, it cannot render most of the web.
Basilisk and its sibling Pale Moon are an example of how hard a fork is (both being pre-Quantum Firefox); features removed because cannot be maintained, incompatibilities, poor performance and many vulnerabilities.
Look at the following browsers: Otter Browser Min Qutebrowser Links Basalisk Surf Bromite (only has 7 contributers)
It is possible. Of course it's possible. Just depends if that situation were ever to occur, whether people would become passionate about that project