  Following our identification of the probable interstellar origin of
high-inclination Centaurs, Morbidelli et al. (2020) issued a rebuttal
criticizing our methods and conclusions. Here, we show that the criticism is
unfounded. Entropy's increase in the past is not an obstacle to accessing the
statistical properties of Centaur past orbits as entropic expansion occurs
around a time-independent conserved quantity that explains the probable orbits'
clustering in parameter space, known as the polar corridor. The Copernican
principle does not imply that unstable motion does not exist in the solar
system. It clarifies the meaning of the dynamical lifetime ensuring that
Centaurs originating in the planetesimal disc are able to return to it in the
time-backward simulation. Our conclusions are supported by published
independent research that shows conventional disc relaxation models do not
explain the abundance of high inclination Centaurs and that enrichment from the
interstellar medium is required. Future physical observations of the identified
Centaurs and TNOs are likely to reveal the similarities and differences between
solar system-born and interstellar origin Centaurs.
