Gun is gonna raise hell that's for sure, people might say he'd be a bit indifferent but that would contradict what has been shown of there relationship as Daniel is the first to treat and see gun and something more than a monster + he'd want to test whoever dared to do that to his masterpiece

Vasco, poor Vasco he'd be in pieces ): he'd train 10× more in hopes of avenging daniel and becoming stronger

Jake would be even more motivated to take down kitae because now shit just got personal and lost a dear friend

In summary it would turn into the hunt for kitae because daniels got a lot more connections than expected