User blog comment:BombMan100/Sion in Bronze IV/@comment-8506165-20150423140847

If Sion is your best champ and you're good enough at the game to get out of Bronze, then yes, he will absolutely "carry" you out of there. It might take a bit longer than with a super-hard carry/assassin champion you're equally skilled with, but it's definitely possible. Make sure you have back-up champions/roles for when Sion is taken or you don't get top or jungle though. I'd recommend picking up ADC or support seeing as they're the least desired roles in Bronze from what I've heard. Sion can jungle as well so I'd recommend learning that if you only play him top at the moment. So long as you win over 50% of the time, you will climb.

It's a myth that you "can't carry" with certain champions/roles. I'm a support main and I win over half of my games in both normal and ranked, and there are people in Diamond who mostly play supports. Not many Challenger support mains, admittedly, but they do exist.