"Nico Rosberg who is an undeniably amazing driver"
Everyone knows Rosberg is average, he did only ONE good season and thanks to him, was amazing and he got the World title.
All the times Vettel and Lewis had equal cars, Vettel won against him specially 2012 and 2013 when Lewis had the best car and Chocked, i'm not sure about what you mean by "defeated", you can only defeat your Teammate, since both of you have equal cars, that was what made Senna and Prost huge. Since 2014 Mercedes have the best car BY FAR, only in 2018 Ferrari had a chance but not even close to Mercedes power.
Lewis is not top 5 drivers, in statistics maybe, but when you can only win having the best car by far, with the expection of Alonso, having only average second drivers, sorry, you're not Top 5.