Look it's ok though. A fighter can make a career of fighting undersized guys to overcome his shortcomings. Canelo and Junior have made that into a science. Just be up front about it. Admit it. Say "I'm not good enough to beat guys my own size and in their prime, so I need to outweigh them by 25 pounds on fight night, or catch them on the decline." Nobody would think any worse of them than they already do. But it would be a little more respectable.