Surprised no one replied. Replying anyway so that the replies to this thread is no longer '0'
The lingo you use doesn't make sense. The two testSteps set/get you have are 1 test case. A load test runs a single test case.
It's not distributed.. 16 is not divided by the # of testSteps if that is what you were asking.
With the one test Step disabled - 16 hits are running, but you have your Delay & Random set. So in your case you have 8 running (wait 1 second) then send the other 8. 8 again meaning all test steps in the test case get 8 executions.
