Well sort of right on both counts.
The correct answer is that you populate ALL the 7135’s (well as many as you desire for your current goal on high) and the firmware takes care of the rest. It is a triple channel driver and uses all 3 channels as needed to get optimal performance.
The single 7135 for moon and low modes.
The bank of 7135’s on the bottom for med to high modes
And of course the FET for turbo and ultra high modes.
You have the amazing Narsil firmware for e-switch lights with tons of options.
The clicky firmware is Bistro re-done and tweaked for triple channels. It should have 31 mode groups when completed and it is hoped that it will allow for 95%+ of people to have the perfect setup without needing to get into the raw code.
Anyone with a mode group idea, please post it here: Bistro for Texas Avenger drivers officially released! Still taking suggestions for future mode groups
You can also leave the bottom side 7135’s off if you desire, there are mode groups that ignore those and treat the driver just like a normal FET+1 setup.
Basically just like the thread in my sig says, the Texas Avenger drivers are setup to be the only driver you need for flashlight building. They are also 100% open source to allow for any changes you may desire to be easily implemented.
The main Texas Avenger driver thread is here: Texas Avenger "TA" Driver series - Triple channel + Bistro or Narsil + Clicky or E-switch - The Ultimate open source driver!