Can a male get to breeding size in 1 year

I have 2 yearling males that are breeding like crazy, but I also have 2 that show no interest at all. It is a craps shoot if they are going to breed or not....

My bee was hatched in July, and he's already 700g. He's been gaining about 100g/month since I got him in September! As long as he's feeling frisky, I'm sure he'll be ready in plenty of time for next season. Not that I have a female anywhere near breeding age yet. XD

Most of them will be mature by age one, if you feed them up properly. Out of 4 male holdbacks from last year, only one didn't make the weight, and that's because he's a picky eater, and actually didn't have the size.
The other 3 are locking up with the girls just fine.
In previous years, it was about the same--every once in a while, you get a one-year-old male who just isn't ready yet, but most of them will be.

What people are calling sperm plugs aren't actually sperm plugs, they're just bits of partially dried semen found inside the hemipenal pockets. (A sperm plug is something males leave behind in a female to prevent other males from inseminating her, and ball pythons don't produce those).
But, sometimes herpers co-opt terms in creative ways, and so long as you know what they're talking about, I guess it's all good.