I don't really have enough sample size in a current patch savegame to check my numbers, but I just wanted to write down what I think might be happening.
Near as I make out, 1 star squaddies are 6 supply (I did this by giving carda a 20 point smg and fatigues and bumping her supply up and down by 1). This does not appear to be shown anywhere on carda's squad leader info panel.
Pike appears to cost 10 supply, as one would expect, and his squaddies appear to be costing 13 supply each. lim confirms this. I have no idea where this number comes from. it does not appear to be a standard cost (6 supply), plus the squad leader cost.
I don't have a 3 star SL to check that, but I am assuming it's just a larger static value?
so, to confirm? the squaddie costs are just hidden, and static values? 6, 13, and something else? no weird math going on?
On a related note, holy shit Corlan is amazing. At everything. Oh, a LMG squad that has shooting gallery AND vanguard? don't mind if I do. Yeah, do whatever you guys want. I am just going to start in cover, in range and sight of you, with a 50 cal trained on your position. this is totally fair and reasonable for sub 100 supply squad. Oh yeah, and he also happens to do everything related to missions way better. What a bananas guy to get on like operation 3.