
Originally Posted by
Christemo
It's as you say with GoB: If there's no experience to leech off of, he doesn't have much to go by or a wielder's strength to copy so he'd be basically completely helpless with them. Whether he can activate the abilities the weapons have anyway is another story, and kind of a blank zone. There's no real reason he shouldn't be able to, but it's never directly said he could do it either.
As for Gae Bolg I wouldn't put my money on it really because even if he can trace it, he shouldn't have the physical capability to throw Gae Bolg as it's meant to be thrown as a Noble Phantasm, and while he could possibly pull off the heartstab, since he just has to leech Cu's XP for that one, he wouldn't be able to do it as well due to the nature of projection (Basically it might not be completely unavoidable).
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Yeah I was thinking that since it's also older and Caliburn it's descendant.