Is the buck in a heavily hunted area? if not id let him walk. he might barely make 150 this year imo, he is an awesome unique buck and i would not blame you for shooting him, but that buck looks to have the potential to be something special, i bet if you waited at least one more year that deer could have the potential to explode. if it was me i would not even consider shooting that deer id take the chance and let him grow. I passed on a buck with a 3 inch droptine last year to hope he will be back and bigger next year. he was probably a 140 class buck and could have killed him opening moring from 30 yards and a couple days later at 5 yards, i let him walk, dont regret it, but its in an area i believe he could get bigger i think he needs at least 2 more years to be what i want. i was also hunting some bucks in that area much bigger then that, so it did not take much convincing to pass.
if thats the biggest buck you find this year then maybe you wanna go ahead and take him idk thats for you to decide. he is pretty small this year but has huge character so its all in what you want.
good luck and keep an eye on him let us know what happens