Yes pigs can get attached to one or other owner.
Boars also can change behaviour as their female owners cycle, and customers of ours tell us that the ladies have more issues with boars being overly attentive than the blokes do.
The sounds pigs make are complex, and without both hearing and seeing it is sometimes difficult to work out noise. For instance the greeting from trixie our tamworth is very vocal, and I would take as a warning from say a saddleback.
It is a question of reading both the sound and body posture/actions that make the whole picture.
We find two things with boars - first keep female (pig) company with them - females can stay with them after mating until just before farrowing. Second, the more you handle the better they are - regular interaction when they are young is the key to getting a dopey boar.
Hm's advice on taking a pig board in with you really does help confidence. I visited an experienced customer today who has just taken on a mature mangalitza boar who has had little handling, and without a board I would be hobbling or worse now. With a board I was able to show how to start to tame him, with little risk to the owners, and hopefully he will become socialised over the coming months.