MMArtist is a category like conditioning and balance. No one has figured out the formula for it. Go to the formus under style reference to get an idea about fight styles.
Yeah, if you check out Yura Fokin's record, the first half of his career was at 155... but then he stopped being able to make weight completely. If you see the gap in fights between his last 155 and first 170, that was how long it took me to finally move him up.
No Excuse