What is a possible weakness of an expert-expert pair?

One is likely to be overwhelmed by the other.
One is likely to be overwhelmed by the other.

They are not familiar with how existing programs work.
They are not familiar with how existing programs work.

They are more likely to take long breaks.
They are more likely to take long breaks.

They may be too set in their ways to work together.
They may be too set in their ways to work together.