If he's just going to be a perfectly ordinary, creepy as hell puppet for sentimental value and so on, then sure, we're fine with that. Enjoy!
As far as ventriloquism is concerned, I assume we're talking something to the effect of, Bro's standing on the challenger platform with Cal in hand and moving Cal's mouth or whatever while throwing his own voice to make it seem like he's standing there in silence and Cal's the one "issuing the challenge"? (If this goes without saying, I apologize, I just want to make sure I'm on the same page as you here!)
If so, then yes, that's fine; ventriloquism is a learned skill that Bro would have, and it's fine to use Cal as a ventriloquist's dummy in that manner.
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As far as ventriloquism is concerned, I assume we're talking something to the effect of, Bro's standing on the challenger platform with Cal in hand and moving Cal's mouth or whatever while throwing his own voice to make it seem like he's standing there in silence and Cal's the one "issuing the challenge"? (If this goes without saying, I apologize, I just want to make sure I'm on the same page as you here!)
If so, then yes, that's fine; ventriloquism is a learned skill that Bro would have, and it's fine to use Cal as a ventriloquist's dummy in that manner.