If it was me, i would let him live and just wait and see what he turns into, as he will always be an easy deer to tell apart, his deal could be from an injury too, so might not pass that on to any breeding he might due
over the past 16 yrs where i was hunting every yr I had a buck with one side growing in strange ways, that I think is genetic's at play
but for the most part, the odd antlers bever cause injury to the deer, so to me, it was kinda cool seeing different bucks shapes of antlers they grew
and many times there were even bucks darn close I had confused with being the same freak ,
yet was just a twin of sorts
so to me, unless its a buck YOU want, I say let it live