Anyone can tank. Easy. Sure low levels can lead and tank, but they should still be required to train up. I think most "low levels" these days are 90+ defence range and magic. They contribute in terms of range damage or tanking for a long time. But they can never contribute as much as they can if they were level 120+. I've led on my main level 110 for a lot of times, and then I've tried it on my 125, the difference was amazing. Simply put, I can lead without pressure, I can last a lot longer, and I can contribute quite a bit more. But I still enjoy being low level, I don't have to train. And I think a lot of low levels enjoy being the early pile and really giving their team/clan a great chance at winning by tanking it.