[bagels]

Two objects at the same inclination can still have very high relative velocity if on different planes.

[HPsquared]

Ah, so like the "phase" of the inclination? orbital plane being a vector quantity (angle between the Earth's rotational axis and the normal vector of the satellite's orbital plane)

[bagels]

Yes. Find a visualization of starlink orbital shells. They are all in one of just a couple inclinations, lots of crossings