He was right. Kraglin wasn't going to shoot him. He'd shot a lot of people; killing didn't bother him, nor did killing people with their back to him. If he was Yondu, he would've killed Krennic on principle, maybe after terrorising him for a bit.

But, ultimately, Kraglin can't be bothered. There's no profit or benefit in killing Krennic. He's going away, which is what Kraglin wants, so he can claim to the table and the remaining sweets. And if he finds Krennic later and there's a reason, he'll shank him and strip his body of valuables.

For now... Kraglin pops another sweet in his mouth and cracks it with his teeth to let the gooey centre flow out. Mm. Fruity.