2nd gear launch

I am missing something here ....
How does leaving in 2nd raise your rpms ? If anything you should be running less rpms at the end .

Run this by me again .

It doesn't. It would either be the same RPM or lower because you made a slower ET run. You will still shift at the same RPM's which occur at the same speeds. Everyone runs a slower ET when launching in 2nd gear, hence less RPm through the traps.