Unless you have a unbelievable amount of land you are wasting your time passing on that 10. Come rut he'll be miles away and shot by someone else. The best you can do in that situation is take the nice 3.5 deer and pass the younger hoping that by shear volume some will make it to the 3.5 age with the even rare older buck. Limiting yourself unreasonably trying to mimic management practices designed for tracts of land in the 1,000s of acres is just hurting yourself and tainting your experience.