Seagate shows us what happens when succession planning goes awry. The board apparently lost both the CEO and the COO in this contretemps. Oops, now one of them has to step in. Given the situation they are in, with no CEO and no COO they are lucky to have a former CEO on the board to take the reins, but that's not a practice I'd have reccomended. A year on the board to facilitate the transition makes some sense, but after that former CEOs should go find other boards to be on. I certainly wouldn't have wanted such a person joggling my elbow four years later. Anyway, I certainly don't know what went on between Bill Watkins and his board that led to this, but Dave Wickersham did absolutely the right thing. If you are a COO, and your CEO is gone, and they are not showing you into his office, you might as well leave now because it is only a matter of time. Painful and awkward time.
In one other note, if you were choosing somebody to manage Seagate through this market, (and absent any data about particular people's actual strategies) would it be the Investment Banker-cum-Corp Dev Guy or the Operations Guy's Operations Guy?