Above you mention dominance issues and fighting.
I've only been keeping corns for about 30 years so I've never seen either of these things. How is it that you know so much of them, that they occur with such frequency for you, that you feel the need to "inform" a newbie on the ABSOLUTE CERTAINTY that these two things will come into play should they dare to keep two snakes of the same species but different sizes. A species known for it's mellowness and ability to get along with it's neighbors, so far as my research has been able to prove.
Do you have first hand experience with this dominance and fighting?
Truly, I'm not looking to treat you like a teenager, no matter what you may act like, but as an uninformed but well intenetioned "seasoned'' but wrong, keeper of snakes.
Can you site any sources? Post any pics? Have a story of peronal travail with keeping corns of different sizes in the same cage?
Or are you just parroting, without having one shred of personal experience, what you have heard others say?