There's a difference between the concepts of race craft, consitancy and line. The super fast hotlappers are very, very good at running the best possible line, but it doesn't help them when racing with other cars. That being said, it stands to reason that the majority of very fast hotlappers also have excelent consitancy just by the virtue of them having such good control over their cars, which in turn can help with race craft. Allas, a few of the very fast hotlappers do quite a bit of online racing as well, so they have three things going for them. They run a perfect line, have excelent control over their car, and can anticipate the crowd. This makes a few of these racers practically unbeatable.
There are many fast hotlappers who are only good at one or two of those things, which makes them very beatable.