ALOT of variables go into this that people don't even think about
Temps, refusals, how much body actually uses, giving "left overs" to your dumpsters.
Any of these if not all lead to some snakes being bigger than others, but in the handlers head they still see it as they are eating on the same schedule.
Not saying the smaller snake is unhealthy just stating some facts that some people don't take into account when they are raising their animals.