The leader is elected by a 3 way split of MPs & MEPs / Trade Unions and Labour party affiliates / Ordinary Members. Ed just scraped in with more votes when all 3 constituents were taken into account, but David Miliband had a clear lead in the parliamentary labour party. This means that many in the shadow cabinet are supporters of his brother David. In total there are - members of the shadow cabinet who supported David:
- Douglas Alexander
- Angela Eagle
- Tessa Jowell
- Caroline Flint
- Ivan Lewis
- Jim Murphy
- Mary Creagh
- Meg Hillier
- Shaun Woodward
- Liam Byrne
If you also take into account those who supported campaigns for the other candidates it only leaves a few cabinet members who actually campaigned for Ed to be leader.
While I am not for one minute suggesting any of these people are being disloyal, it is possible that there are some people who feel that Ed is taking the wrong direction.
It surely makes more sense for a leader to pick his/her own cabinet which more strongly represents the general thinking of the leader. It also gives the leader the opportunity to put a shadow cabinet together who will continue in those roles once Labour are re-elected, rather than the leader having to carry out a re-shuffle of places once in government.