JEDDAH :Signing Formula One champion Max Verstappen would come with "a lot of downsides" for Mercedes, who would be better off keeping their current drivers, Williams boss James Vowles said on Friday. The sport has been swept with speculation about Verstappen's future after Red Bull's motorsport consultant Helmut Marko expressed concern the Dutch driver could leave at the end of the season. Verstappen, a four-times consecutive champion who would be a top target for anyone able to afford him,