Two Male Guinea pigs, Zane and Sumi/Zumi

I got them back in February, got them settled in and finally came up with names my bf named the smaller looking one Zane and i named the bigger Sumi/Zumi. I introduced them and fought a little bit and they both tried to be dominant over one another, I still don’t know which one think he’s the more dominant one, but they have bonded. Sometimes they sleep next to each other. Zane goes to Sumi anytime he’s cold or scared or whatever because he feels more protected I guess. Also anytime you shakes bag Zane starts squeaking and Sumi sometimes does it’s hard to hear him because he’s so quiet but yeah anytime a bag shakes he thinks it’s for him. He thinks it’s time for food. When I got them a tunnel that goes three ways they started to popcorn. Around the hours of nine and 10 they start to popcorn a lot and be more active. I heard that popcorning exerts energy and or they are happy. When I first got them, Zane was quite skittish and shy. He wouldn’t come out of his little house anytime he was out and I came up. He ran back in. Sumi on the other hand. He kind of warmed up to me quickly. sometimes he would skerry back into his house.