Mark Cuban’s last night in the Tank felt like a highlight reel of everything the show turned into: big personalities, weirdly specific products, hard math, and people trying to decide how much of their company they’re willing to sell to move faster. Season 16, Episode 20 had four pitches: giant candles, a tick-removal mitt, deviled eggs as a full-blown concept, and underwear you’re not supposed to see at all. On the couches: Mark Cuban, Barbara Corcoran, Lori Greiner, Daymond John, and Kevin O’Leary. (ABC) Big Ass Luxuries – The Candle That Was Basically a Small Appliance The first founders to walk in knew exactly how to use the TV moment.…