It's easier to tackle a tall, thin guy. He doesn't have the lower body strength of your typical 6'5" 265 TE prototype. Travis Kelce, for example, doesn't have to think as hard about breaking tackles. Bucky is too tall and thin to be a traditional blocking, high traffic TE, but too slow and doesn't have the speed/athleticism in my opinion to be a great receiver. That's not effort, that's biology.