A SpikeSolution is a great way to reduce ambiguity, and for little ones - one-liners and maybe a little bigger - there's no harm in pairing on a spike.

But for longer investigations - the ones requiring real skullsweat - don't try to pair. It's a matter of bandwidth; your corpus callosum is an information bus that enables you to assemble completely new ideas much faster and much easier inside one cranium than by discussion between two cranii.

See also: HowToPissOffYourPair