You're trying to compare apples and oranges. You cannot look at a CB buying Euros as an intraday forex trader. They're most likely buying Euros for a reason other than "investing" or "trading" like you or I. They might want to diversify holdings, or pay a debt, or invest in the EU, who knows. The point is they've determined that the 1.27 area rate is what they need to make their financial deal work. They don't care about the rate blowing buy them like you or I, and they certainly aren't trying to influence the market (unless they're protecting options).
If the price action blows by them, then all it means is that they got all the EUR they put in an order for at the price they wanted.