So far, it's true. The divergence is where Spirit took on more debt & rapidly increasing costs, whereas F9 has so far managed the costs reasonably well. While it's certainly possible a bankruptcy could be in F9's future, I'd bet money on them existing in 5 years, whereas Spirit is dead today.

If you have more to add to the convo, rather than just providing some useless fear-inducing driveby, please do share why the two are remotely comparable.