Now you see that ETH is still tied to bitcoin price health. Now when BTC got dumped hard you can see that it pull ETH down. It doesn't seem to me that ETH is going to take over bitcoin soon, at least not yet in the near future. Maybe it can later on but I am positive on bitcoin.... Now we can see that "flippening" is highly unlikley to happen as price of ETH is not backed up by fiat at most.
the correlation is tied but also random, sometimes they match sometimes they don;t never count on it.