^^No, I am just talking about the outer fire green valve. You can run them without doing this. It is just so you get the full range of the lynx.
It is easy to kill a GTT by not using all three knobs in a given stage of the torch, like using the green and blue knobs as a primary and a secondary. They go together to make the right flame. I know a guy that killed a Delta Mag by running it this way and he didn't realize he had even killed it. He didn't use the blue knobs at all.
I almost destroyed mine a while back by accidentally leaving a very tiny flame on when I thought I had turned it off when I had it bolted to a lathe carriage. I came back five minutes later and had to spend 30 minutes cleaning it to get it back to normal. If I had waited longer it would have been toast and I would have had major problems making a living on my backup torch while I had the Mirage rebuilt.