General discussion

So we are at 9.0.11 and upgrading to 9.1.6. I was under the impression that you had to actually install 9.1.0 and then install 9.1.6, but a co-worker is saying that he has been able to upgrade to 9.1.6 directly by just downloading 9.1.0 and 9.1.6 and installing 9.1.6 right from 9.0.11.

Is that right? Doesn't feel right.