I understand the dilemma (coming from the person that went from 2 to four because I apparently don’t have the will power to volunteer at a rescue because I end up wanting them all LOL).
If you feel like you can care for the bunny and can either keep him, or keep him long enough to appropriately rehome him, then I say go for it.
If your goal is a trio, you might even find it easier to just work with all three together. From my personal failed-trio experience, once you have a pair it can be mentally hard to push forward with the trio, because you already have a happy pair.
I will say that going from 1 to 2 bunnies doesn’t feel like too much extra work, but going from 2 to 3 does a bit, especially with different enclosures. So consider the burden of taking care of three single rabbits for a while. You can always safely rehome the 3rd if it isn’t working out, and at least you’ll know you helped him find a better home (and getting it neutered/spayed is huge!).
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.