Nothing against Jack, but this much management chair swapping is not good for a company. Tells me there is a lot of internal struggle going on. Perhaps the shareholders are pressing for monetization, and Ev pushed back on that (or tried and failed) and now Jack is coming in to give it a try.
The management chair swapping occurred when Ev pushed Jack out, and then later realized he was burned out and faded out as Dick stepped in.
Having Jack back involved in the company - assuming he is fully committed - is perhaps the best thing that can happen to Twitter right now. New ideas, stability and founder support.
I think it's great news for everyone, including us users.
