Mercedes (Ross) openly admit that factory teams will have an edge.
It sounds valid only if Mercedes will not supply engines to other teams.
Currently both McLaren and Force India is faster than Mercedes.
"In reality, we will probably have two customers and they will be given parity with the engines that we use at the works team.
"So I don't think teams are going to have a worse engine because they are not a works team.
"But inevitably there is a closer involvement with how the engine is created and developed, so that is a fact."