Its true, there are no rules which clearly define what to do with leaver's items, usually there are no problems because of it. In this game i saw sniper taking 1 or 2 items and the rest was sold by leaver's hero, so everyone benefited from that. Sniper was your carry, so i really don't see why you want to ban him for taking a few items so much. Also like mentioned by the guy above, noone said anything about wanting to take any particular items from the leaver.
Zeus was indeed farming solo a lot but i barely could see any teamfights he could have participated in. Mostly your teammates kept getting caught 1 by 1 and zeus had no chance to help there. He also was coming to important fights, such as defending barracks and he was dewarding whole game.
The new season has started so you probably will encounter newbie/bad players a lot. There is no need to report every small case or search for a reason to get someone banned on purpose. There is really not much point in banning someone because of 1 word said in rage or for not noticing a teamfight about to start (generally speaking)
!denied