"He is in the final phase of fine-tuning his craft, if I can put it that way," the Australian told the Dutch publication Formule 1.
"Is he already Lewis on a Saturday? Yes," Webber said. "Is he already Lewis on a Sunday? No, he is not. But that's normal.
"You don't win five world titles in your first five years in Formula 1. Nobody ever has," the 44-year-old, who won 9 races until his retirement in 2013, added.
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