Conceptually, you don't need z5 for swirls on what should be a swirl-free new car. My dealer treated me to some dealer-installed swirls during prep, which I ended up having to polish out w/a random orbital and 3m scratch-n-swirl remover.
The clearcoat on the Hondas/Acuras is quite soft, and minor swirls or marring is inevitable. Lighter colors don't show them as much as darker colors. If you have gold (is there a mesabeige in the Pilot?) or lighter (e.g. Silver) then no worries. GG, Black, red, green show every flaw.
In any case, IMO (and based on feeback from other MDX owners w/darker colors) the z5 lends a "deeper" shine than the z2. Like I said, I found the z2 gave a muddied appearance. Best way to describe it: you know that film that builds on the insides
of the windows from plastic outgassing (or human outgassing, I s'pose
) - looked like that on the paint, even though there wasn't a "film". FWIW this wasn't the case on our black Lexus (which is a flat black rather than metallic on the Acura).
People on other detailing boards are split betw z2/z5 on darker colors. Has to do with the paint underneath. YMMV.