Uhm... Actually...
You had 43, YOU FILTHY FLUPPING LIAR (lol, jk, please don't take it personally)
But in all seriousness, that Lux didn't actually do all that badly. She had the most kills, the least deaths and second most gold on your team... While up against LeBlanc. She might have just simply been playing it safe because of the enemy Xin, LeBlanc and Graves being ahead, and that MIGHT have been misinterpreted as her being bad, or as you put it, "A Potato".
Now back onto the joke-y side of things!
Why weren't you playing Brand? Your Summoner name is perfect for playing Brand.