tbh i saw highlights of the Barrett fight and i was actually impressed his punchin technique aint that bad, imagin if he had a good trainer with that size and that head he could be unbeatable
Like almost all people that size, his reflexes are very poor because his nerves are so long. I do wonder how some of the most athletic basketball players at that height range would have fared in the ring, though.
As McGrain said, he can't generate torque because his body is too rigid. And because of the nerves situation, he can't generate any speed. He hits hard compared with the average person, just not hard for HW fighter. Although he's not as tall, Tye Fields has some of the same problems.