The problem is that the model of a very elliptical orbit tends to scatter the orbitting body. All it takes is the slightest perturbation; highly elliptical orbits are those that are most unstable. That's actually the reason the orbits of the planets are so near circular, the elliptical orbits that are needed by Sitchin for large bodies just prove to be dynamically unfavorable. Capture processes for such bodies in the ellipticities needed by the Sitchinites are out of this world. When the cross-section is such that such a capture couldn't occur in the age of the universe, you have a problem. Right now, it would seem that the ellipticity is so ridiculously high (a ratio of major to minor axes of 1:tens of thousands being very generous) and with the size requested (planetary) the capture timescale for objects in our galaxy is well over a Hubble Time. More than that, I haven't seen a system that could capture a highly elliptical orbit as is needed to show first the fact that there has been no observation of such a thing.

No, the orbit is physically untenable from any way you look at it.

To put it a different way: there's a small chance that tomorrow quantum fluctuations will cause you to be able to walk through solid concrete. However, the time-scale for such a confluence of improbables is so long we call it an impossibility. There are many "impossibilities" in physics that are just so very unlikely that's how they are labeled.

And don't misunderstand me. This isn't just a remote possibility: this is a possibility that flies in the face of all Copernican principles ever considered. It's just as likely to be correct as Creationism, so I lump them together.