When a fan leaf is removed another one should grow back, but if you are talking about FIM on the fan sites, the answer is nothing much- you have to FIM on a growing tip.
To me supercropping means something entirely different though- the practice of starting seeds/cuts in very small containers and maintaining an UNINTERRUPTED canopy through all growth stages to take advantage of light, and repotting rather frequently so that there is no time where a plant is sitting in a SUPER oversized pot losing light to the media surface. Application to cannabis growing would be using like a 400MH for veg with all the plants clustered under in small pots and then at least 1200 total watts HPS for flower and spreading them out and raising the lights as they grow larger and fill in.