if your point is to "seal the cuticle" then aloe vera juice is all you need but if you use a leave-in for more than that, like styling and what not then, I would think that you would need that other stuff to help hold your style.
I use an adapted version of Kimmay's leave-in for twists and I use: aloe vera gel, HETT, jojoba oil, coconut oil, olive oil. This works great for my hair.
3c front crown,4a in middle back
LOIS: OS, thin, dense, cottony