boarbonding

Hi all! I'm sorry about the long text but can someone please, please give me some advice about bonding my piggies? So, I have three guinea pig boars, two bonded brothers, Billy and Teddy, (around 16 months old) and one named Carlos, who I got separately (between 4-6 years old, probably a cuy)...

I took my two boys Rocky and Capone to the local rescue to do a bit of boar dating today. They were separated on January 14th. Unfortunately Rocky did not find a suitable match, he was too dominant for any of the males at the shelter. My plan next is to get Rocky neutered and find a nice sow...