Why didn't Morris kill Gao Guang, why not pay any price to take him down?
The question is akin to asking why Emperor Gengshi of Han didn't kill Liu Xiu from the start, instead giving Liu Xiu the chance to go to Hebei and gather the volunteer army.
It's like how Cao Cao, while leisurely boiling wine with Liu Bei, didn't just order his executioner to chop Liu Bei's head off right there.
Currently, Gao Guang can't even be considered prominent in the arms industry; he's simply crossed over from the PMC sector as an emerging talent—at most, he's a minor character.
That's just like when Zhu Yuanzhang had just joined the Red Turban Army and Emperor Yuanshun didn't send a large force to make sure Zhu Yuanzhang was killed.
When compared to Morris, Gao Guang is merely a rookie in this business. What need does Morris have to go all out against Gao Guang? After all, he's already won, and Gao Guang poses no threat to him.