Did you even read my post? You can know everything there is to know, relativity theory included, but if you can't communicate that information to students it doesn't matter. Excellent scholarship doesn't mean quality teaching, just as it doens't mean poor teaching. Even a average law professor who isn't renowned in their field is going to know quite a bit about the law, and while they may be a bad teacher, they could also be a amazing teacher who students learn a lot from. And if Einstein was a bad teacher who I didn't learn anything from, then yeah I'd rather learn from someone who wasn't cited much but was a excellent teacher who I learned a lot from, wouldn't you? Or maybe you'd prefer the prestige and forget the actual learning part?