I am pretty certain that Eisner bringing in similar attractions that the competitors had, I would have to say made the DisCo more competitive. He said it simply, Disney is not the only thing to see in the state they are in. He recognized that people what to see the other attractions so he brought them to Disney. So in Florida, instead of going to Bush Gardens, you have DAK. Instead of UNI you go to Hollywood studios. Coming from the UNI world, he had a background for that.
Frank Wells as I understand was his sounding board. At least, if it was a bad or ugly idea. Like many cooperate america companies CEOs like to surround themselves with yes men. When the you are the CEO and you "have to be right" even though you are not always right, you have to have someone counter balance you to let you know when you are wrong. Most people will say the original DCA was a flop, because Eisner stayed the course. DAK brought guests in, DHS brought guests in, so why wouldn't he think lighting would strike again. It is not just a counterbalance, you still need someone with experience to say which direction is a better one to take.
The real question who would stand there and recommend a billion dollar idea is bad, and which one is right?