If they were to buff Cyborg, I'd rather it play into his existing gameplan than try and turn him into more of a mix character. I'd buff recovery on TA, make the armor on his grapples more reliable, and maybe play around with recovery/startup on trait. Basically let him be a bit better at his current gameplan.
Overall though, I think he's fine right now, and while any buffs would be welcome, buffs for cyborg seem more like a want than a need. He's middle, maybe slightly below middle of the pack. It's not great, but it could be worse.