I wouldn't want to have to depend on my chin to get me through, so although Hagler is a definite ATG, no Hagler for me. I'd go with Jones Jr., or a SRL, although Norris is a fabulous choice as well. Leonard is close to a TBE for me... so probably him. He fought the best and beat the best. He only got KO'd when he kept fighting beyond his years, as many have done. He was the consummate boxer, but could summon the power when needed. He also retired with all his faculties.