At the weigh in Uchiyama looked the bigger, stronger man though the challenger did appear confident, as he has done since arriving in Japan. It seems that spending the year out of the ring has hindered Uchiyama's physique which appears just as power as event and in fact if anything the time out of the ring may have allowed any niggling issues to heal themselves.
Although the two men where physically very different their weights were very similar with Uchiyama weighing 129¾lbs and Perez weighing 129¼lbs, exactly ½lb lighter. Of course this puts both men under the 130lb limit.
It is, perhaps, worth noting that this Uchiyama is the same weight he was for his bout with Daiki Kaneko, exactly a year ago, whilst Perez is his lightest in more than 2 years. It's unlike though that either has struggled with the weight.
(Image courtesy of http://www.watanabegym.com)