If Floyd never fights Manny...

[ruthless rocco]

What does style have to do with moving up to capture another lineal title?

It's not just GGG. Why didn't Floyd face Martinez? Cotto did. In fact, many more people asked for Floyd to face Martinez than they are for him to face GGG and people have called for Floyd to fight Martinez for the last 4 years. Martinez himself asked for the Floyd fight many, many times. To Martinez, Cotto was just a consolation prize because he wanted Floyd. Floyd wouldn't take the fight. It's documented. Floyd Sr. said he's too big. He wasn't too big for Cotto.

Why didn't Floyd fight Martinez when Cotto fought Martinez?

As I said in my previous post which I assume you simply didn't understand:

Cotto is a naturally bigger fighter who is younger than Floyd. He is accustomed to fighting like a tank and taking punishment to give punishment. His style and temperament are suited to getting hit a lot to land a lot.
Floyd is a more refined fighter whose assets are his speed his movement his agility his dexterity and his power(at lower weight classes). Floyd is at an age where he is not able to move up in weight and bring his entire skill set with him. Floyd is aware of his physical limits. He knows that he is slowing down, becoming less agile, that his legs don't respond as quickly, that the power he possessed at lighter weights isn't as effective in higher weight divisions. He knows that he cannot bulk up anymore than he has and still be effective at a higher weight. This means fighting fighters that are a lot bigger than him is out of the question. Being aware of your body in the ring outside the ring knowing your abilities and limits, when to take a risk and when to be reserved and focused are traits that champions posses.

That's what styles have to do with it. It's a very simple concept. I'm not sure why you can't grasp it.