How much do we even know about Bleda?
So basically next to nothing?I'm not sure how we can even predict what he can do if we cannot accurate assess his abilities or personality.He and Atilla seemed to rule jointly for a while, and invaded the Eastern Roman Empire, getting as far as Constantinople before turning back. Maybe with Bleda in charge, they'd have continued to hassle the east instead of Gaul.
Plus, Attila only turned west when he'd essentially milked the Eastern Empire for all it was worth. Any attempts to extort more from it would have simply run into the law of diminishing returns. Quite possibly Bleda, if he was successful enough to find himself in a similar position against the East, would turn his attention to the West just like Attila did.