I would do what DQ says, I was in a similar situation on my last lease. We asked our land owner about the neighbors place and the probability of leasing it as well. The leasees on that place were shooting everything that walked and we wanted to try and secure both ranches. Unfortunately the neighbor was unwilling, especially after him and our landowner had it out about each others hunters. It's worth a shot, worse that can happen is he says no.
Don't take life so seriously, you'll never make it out alive!