The other issue at hand is that Scotch is 9 months old, and 9 month old piggies are in piggie adolescence. So he might just be too crazy wild to have a buddy right now, but like human teenagers, things can change once he's a full grown adult (about 1-1.5 years old).
Not everything is absolutely solved by adopting a tiny baby. Actually that can be a problem sometimes when the baby goes through adolescence, because their personality can change and cause irreconcilable differences with the larger pig. Sometimes it's better to just get an adult, because then you know what their adult personality will be like.
Neutering and pairing with a female is always an option, but it seems that you got him from a reputable rescue, so if they say he's a single then he just might be.
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Bacon4EverEver - do you mean they run into their own houses, not cages?
On getting Scotch used to you: hand feeding is the bomb! It makes your pigs so much more interested in you. I've got 5 girls and if they think I have veggies they'll come right out into the open and stand on their back feet and beg like crazy because they know that's how they get veggies! Also just letting your hand sit in his cage, so he gets used to it not always scooping him up can be good. Mine are learning one hand pets and two hands scoop... Hopefully. I think some of them get it.