[watwut]

It does not work, at least did not worked for us. The problem is that in any single situation it is easier for expert to solve it alone then explain and when then there is sudden need to explain, expert can't do it effectively. Because he was not explaining for years.

Plus, you end up being in a limited box and have harder time to grow by learning new things - project structure keeps you in box and you can't easily expand it by taking tasks to learn something new.

Finally, expert is sort of fake expert - expert only because others are kept clueless. Not because he would had such great knowledge objectively, but because we decided this is only his area. There is no other engineer to discuss issues with our to compete with.