Bredd's not a real person. We're told he's made up, and Smiles said she saw him in BH yet in DoD said she didn't even think he exists. So at the outset that kinda rules out Crump as being Bredd, as he's too crazy and unique in appearance not to be noticed. He's just a figure they used to one up each other's stories or explain how something happened. For example:
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'Ah, him. Who else would it be? How silly of me. I don't suppose you know what he looks like?'
Hedge shrugged. 'Big, I heard. Got a brow like a rock shelf, a hamster's eyes, a nose spread from here to Malaz Island and he can crush rocks with his teeth. More hair than a bull bhederin's dangly sack. Knuckles that can bust a Master Sergeant's nose—'
'You can stop there,' said Pores. 'I have an amazingly precise picture in my head now, thank you.'
'Mayfly says that's all wrong, though,' Hedge added. 'Bredd's tall but skinny, says Mayfly, and his whole face is tiny, like the bud of a flower. With sweet and pleasant eyes and pouty lips—'
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'We're missing a thumb, but we heard there's a heavy without any thumbs - might be over in Blistig's legion.'
'Indeed, and what would his name be?'
'Nefarias Bredd, sir.'
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'The Bonehunters' motto, Captain?'
She would not meet her commander's eyes. 'Not a serious one, Adjunct. Coined by some heavy infantry soldier, I am told —'
'Who?'
She thought desperately. 'Nefarrias Bredd, I think.'
And caught, from the corner of her eye, a faint smile twitch Tavore's thin lips. Then it was gone and, in truth, might never have been.
I'm leaning towards hallucination myself. Hedge was with Fiddler when they 'met', yet when Fiddler asks about Bredd Hedge gives him a blank look.
Antiquis temporibus, nati tibi similes in rupibus ventosissimis exponebantur ad necem.
Si hoc adfixum in obice legere potes, et liberaliter educatus et nimis propinquus ades.