It is just easier when you have two kittens from the same litter where the smell is the same and they were already buddies. However, the younger the kittens, the easier it appears to be to introduce them and get them loving each other as buddies. They become bonded to each other and not so much to the human, which is maybe what this member needs. We will just have to wait and see if she returns and updates us on how things are progressing. However, it is possible the member doesn't have the funds for another bengal and her breeder may not have any available until an upcoming litter.
It's great when new bengal owners find this forum to post questions and ask for advice. Each member here will have a different opinion -- and they aren't wrong. Different things work for different people and bengals. We don't know the environmental situations for any cats but our own. Thus, opinions are so welcome and needed, even if we all don't completely agree.