My Friends BP

[5alive]

I have a friend that has a BP and i use to be roomates with him two years ago when he got him. The BP was doing awsome feeding good and was nice to handle. I moved to a different city about a year and a half ago i went back to visit my friend and the BP was the same size as he was when i left. I asked him if there was anything wrong with him and he said no just that he wasnt able to fed him on a regular schedual (spelling) because he is gone alot with work so i offered to take him off his hands but he didnt want to seperate with him. I am just curious if the Bp will ever grow to his full size now or will he be stunned from bad diet that he has been on. He doesnt look starved or anything like that but he looks the same as he did when he was 6 months old and he is 2 years old now. Let me know what i could do to help the snake get back on track and taking him away from his owner is not an option and all negative remarks arent needed in this thread so keep them to your self. I know that my friend has gotten someone living at the house that wont mind helping out when he is gone. let me know if you think that he can get back to a normal size and what diet would be best for him thanks.