I'm trying to understand side chains and I think I have figured out a useful situation where to use it, ideally I'd like some one to confirm if this an appropriate use or at least, I've understood the theory. This does mean the answer could possibly be very short!

I've never found explaining something so difficult as explaining audio!

When doubling tracking vocals, I often find the ends of words/phrases aren't perfect with each other (it's hard to describe), meaning there is a timing issue or an 's' sound went on longer on one take compared to the other.

When I double track, I typically have 1 voice on top of the other (meaning vocal1 is 10db louder than vocal2). In this instance, the quieter voice still does it's job but sadly it's not so quiet I can't hear the fact the 2 voices are out of time.

I was hoping I could use a side chain and a gate. This means that, when my vocal1 has audio playing, the gate is totally open. When vocal1 finishes, the gate is totally closed, killing vocal2 regardless of whether there is any audio being performed at that stage on vocal2.

I know this process only works for the ends of the words where vocal2 goes on longer, but that is fine.

Is my theory/conception correct?