Somewhere in between seems best, only hire folks that really understand and fit in your vision and hire people that are going to be key for where you are slightly ahead of now over the people you needed a month ago. The team I spoke about needed designers then but now that the team has more designers than developers there's an odd balance that has lead to a beautiful but not very functional product. Their homepage changes more than their product.
Agreed Ev is a class act. Im really looking forward to seeing what Obvious come up with.
Then again, maybe in a few years Twitter will end up buying Medium. We'll have a second coming of Ev, followed a Twitter renaissance, wherein he expands on what he learned doing Medium.
However, I agree that is unlikely to be his goal since he has taken enough off the table in Twitter fundraising rounds that he likely wouldn't need to sell just for the money and re-entry into Twittrr, which would likely be the purpose of such an acquisition.