The Overweight is not the best at capping because of his slow speed. He's decent at defending the intel but a Constructor is usually the better choice for that task. He's good at area denial (space control), defending CPs, but his biggest strength is keeping the enemies busy. When half the enemy team is desperately trying to kill him, then they are not defending their intel and not capping your intel. His teammates will have an easier job doing their respective tasks.