Comment by twic

The team being described here was one where all work was done paired. Senior engineers were never delivering by themselves. It sounds like you have experience of teams which are not like that, which makes comparisons ineffective.

The real reason Tim showed up as having zero productivity was because he always let his pair put their name on the ticket, and so get the credit for it. This is really a story about how things go wrong when a ticket tracker designed for solo work is used by a team which pairs.