Hey there Flemish – As someone with a bonded five-some, I thought I would comment and give you some positive and negatives of having such a big group!
To begin – having a bonded group is AMAZING. It’s definitely worth it in the end BUT there is A LOT to getting to that point and there is no guarantees. There is absolutely NOTHING better than watching my clan all snuggled up after dinner. Literally it makes my heart melt every single time.
You should really consider the things MD said. She’s completely right. Do NOT get a another bunny for those reasons. Never for your other rabbit. Because as she said there is absolutely no guarantee they will bond and no guarantee they will STAY bonded. Bonded bunnies can break up at any point and become unbondable even after years of being together. Although you have a rescue willing to help you – there is STILL no guarantee. They bond for 1-2 weeks BUT most bonds take far longer than that. Especially in a group because of the many different dynamics you have between them. I also think you shouldn’t decide based on your bunnies personality. You SHOULD in the sense that you need to find a bunny that fits well with yours BUT in my personal group I’ve figured out that the saying “Opposites Attract” seems to be VERY true. I have three very hyper Tans and two very mellow Lionheads. My hyper Tans have been bonded since very young but oddly enough each Tan has become “best buds” with one of the calmer ones. They compliment each other in a way. SO with that being said, you may have the OPPOSITE reaction to what you would think when trying to bond a hyper bun to your already hyper one. You also have to be ready if something happens such as your current pair splits up and kicks out the other bonded bunny. It’s very common for this to happen and if this DID happen, would you think about adding a fourth so everybun would have a partner? Another member on the forum had to do this recently while bonding a trio. Her rescue kept the buns for a bit to try and bond also and it just wouldn’t work so she ended up adopting a fourth since the WHOLE point was so the buns would have friends. Which seems to be important to you with your rabbits also.
I also was of the mindset that it wouldn’t be more work having more buns if they were all bonded and in the same area but really it is. It really equals four times the mess as one. And it means I have to give my love and attention to each bunny still as you want them to remain very connected and bonded to you, not just your other rabbits. Working full-time now, I can honestly admit that sometimes it’s very difficult to give all five the time and love they deserve each night separately but I’m lucky to have a boyfriend who can help out with that each night also.
Just make sure you are ready for an additional bunny in the house! I always think I am but it’s ALWAYS a shock. Adding in another bunny can be VERY stressful and time consuming. In both bonding and just simply caring for them.