Poor piggie . 2.6 is young to die, especially out of the blue.
You know the 'piganalities' of your boys, but trios of boars are tricky to maintain. And if it didn't work out then it would unsettle the boar pair.
You could either : get him a piglet boar, then you'd have 3 pairs again or side-by-side him with the pair you think he'd get on best with. He'd have the company of the other boars to chat to without the risk of them feeling he's invading. He'll miss his cagemate but he's not alone alone IYSWIM.Then in the warmer weather you could see if they could get on as a trio, having seen how they interact and do some careful introductions. (If it doesn't work, then you could think baby boar). My 2 boys like each other being there but they don't tend to snuggle .In their haybox there's always a respectable distance
This is one situation where neutering + sow would be a no-no. Five boars would be a nightmare if they got a whiff of a sow
Just out of interest- how did you end up with 6 boars? All those male hog egos!
don't think our neighbours would be too impressed with porkers!
the plan was to put some of the together, but it didn't work out. some get on with others, and some only get on with 1 other. I was going to get the all castrated, but it was too damned expensive.
we had 4 in 2 hutches, and then someone moved house to a house without a garden, and asked me if I wanted her 2 piggies complete with hutch. well how can you say no to an offer like that?
the same also happened with our rabbits, we had 2 girls, someone asked me if I wanted another. I went round to see him. he was 8 months, didn't have a name, they picked him up rarely and used gardening gloves so that they didn't get scratched. his hutch was barely big enough to turn round in anyway I had already taken the 2 girl rabbits to be spayed as they were getting 'feisty', so I took Ringo to be castrated, bought a 6 foot hutch off eBay for £20 and bob's your uncle. they are all dwarfs and get along fine.
anyway I have a small scar on my hand from when Fred (the one who died) bit me the day we got back from our holiday. he was only a baby.
the single boar (Joe) is now in a large box in the kitchen until I decide what to do.
thanks for your advice so far, and if you have any more help etc please let me know.