BERLIN, Germany - Sebastian Vettel has been backed by Red Bull team principal Christian Horner to become an even better driver. Vettel become F1's youngest triple World champion in the season-ending 2012 Brazilian Grand Prix.Christian Horner: "I think as his experience grows, he is continuing to grow as a person. We've yet to see the best of him." Horner described Vettel as "among the greats" in F1.NEWEY KEY TO RED BULL SUCCESS The ominous warning to Red Bull's rivals came after the team clinched the Drivers' and Constructors' World titles for a third year in a row.Vettel showed immense composure at Interlagos, finding himself at the back of the field and facing backwards after an early shunt before fighting his way up to sixth to beat Ferrari's Fernando Alonso to the title by three points.Car designer Adrian Newey was integral to Red Bull's success and Horner hailed a technical genius who almost all the other teams would love to have.Horner said: "The team is working fantastically well, we have some great members of the team with great technical leadership from Adrian Newey, but it has to flow through the whole organisation and I think what we have achieved with sustained success is quite phenomenal. "F1 at the moment is going through a halcyon period."Mercedes finished in fifth after another disappointing season, who waved goodbye to retiring seven-times champion Michael Schumacher after three years of failure since his comeback.While Mercedes crave a man like Newey to try to substantially boost their performance, Horner thinks 2008 world champion Hamilton's arrival behind the wheel will at least give them some hope.Horner said: "I think McLaren is a weaker team without Lewis. I think McLaren would admit that."Whichever team had taken Lewis, he would be an asset. I'm sure he will naturally add performance to Mercedes next year."