I didn't pick off weak players, I went against nutra when everyone was equal, whilst allied with qoou. I then accrued the area of two players, and expanded, reaching the far side of the map just as Thlayli and Luckymoose had finished off Shadowbound. I grabbed a few outlying systems, then allied with Luckymoose to take down Thlayli, and bring around the endgame. I never picked on a nation that was the weakest at the time when I initiated hostilities against it- bombshoo got taken down by Luckymoose and neighbours, and Tuxedohamm was taken down almost singlehandedly by qoou, in a long dragged-out performance that took most of the game to complete.