I don't think anyone can realistically expect to see the same deer next year. Deer move and patterns change and you have no way of knowing if he will even be in the same zip code next year. BUT I would pass on him because I absolutely positively guarantee you that he won't get any bigger if you kill him right now. Some one else may shoot him the next day, you never know. But you know for sure that if you kill him he won't ever get any bigger so you let him go and HOPE you get another chance when he is bigger. If not you hope someone else does and maybe you get a crack at one that someone else passed up last year.