Opening prices are estimates. As participation, conditions, and flow arrive, prices update. The closing price aggregates the most information of any point in the cycle, which is why analysts use it as a reference.
A move that appears across venues within minutes is usually a response to information. A slow move at one venue alone is more often position or inventory management. This is a framework for reading moves, not a claim about any specific market.
Comparing an estimate against the closing number is a standard way to evaluate whether an analytical process added information, independent of whether any single outcome landed.