I honestly agree with this, ZMC is definitely not the best team for Zero. None of those assist really makes his mix ups threatening or really cover him if you opt to use jam session over wisel shot especially. Even then wisel shot is out classed by a beam assist or fireball assist and Jam session serves its niche in his in coming character mix ups and combo extension.
I believe as much as well, but ZMC is no slouch. Personally, I feel like a team that creates mix up opportunities + Zero's high mobility would be way scarier than the one touch stuff from ZMC. With that setup, he has to get the one touch, something that can be scouted and defended against whereas a vortex Zero will whittle you down absurdly fast.