Rehoming Cat. Male, great hunter/mainly outdoor (Eureka)

Hey! Long story short.
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I rescued this guy from a farm where he was being neglected.
Ive had him for over a year now and has not been able to integrate with my other two cats.
He is a very dominant cat, mainly outdoor cat, he only comes in when it’s cold and raining at night time.
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but immediately goes back outside in the morning.
I am not sure of his exact age but I believe he is on the older side.
His tail is thinned and hair seems thinner than a younger cats fur.
He hunts very well though and would make a great farm/barn/property cat.
He is sweet and affectionate when he warms up to you.
His name is Leo.