I think this could easily be addressed by instituting rules within an org, especially if there is enough discontent about it.
I am not disagreeing with you; stating objectively that if there aren't rules, people can't be held to them. I have no dog in this fight, if anything, I thought the scrawny fuck should have been put on weight gain, considered mentioning this to the org owner, but I went with the logic that unless there is a requirement for him to be of certain weight, I have no leg to stand on.
Also, 135 is not defined, at least not in writing that I see anywhere; on the contrary, some orgs say that in order to fight at 145, one has to weigh no less than 145, whereas 135 is just assumed that managers will stick with something reasonable.
TLDR: If there are recurrent concerns, implement a written rule (at org level) to keep things civil and uniform, this will resolve the issue and avoid potential bickering. Some managers will not adhere to the expected, yet unofficial norms if you leave it up to them, and there is an amazingly simple solution for that. Dont want to add weight to your fighter? Cool, but you won't fight at 111lbs at 155, you have the option of adding weight or fighting at appropriate class (Class A is x to y lbs, Class B is...with understanding that 135 class is defined as ranging from x lbs - however many lbs a fighter can weigh pre-cut). No need to reinvent the wheel.
P.S. Shit, TLDR ended up being just as long as the main body. Fail.