The gap that opened after the substitution

Watched Atalanta against Monza last weekend. For the first hour, Monza kept their defensive line high and their midfield block narrow. The space between the units stayed compressed. Atalanta couldn't find the runner between centre-back and full-back.

Then Monza made a change. The holding midfielder came off for a more attacking player. Suddenly the distance between defence and midfield stretched to fifteen metres. Look at where the space appears when that happens. Atalanta's attacking midfielder started dropping into that pocket. He had time to turn and pick a pass.

The full-back on that side had been conservative all game. With no cover from the midfielder, he didn't know whether to squeeze or drop. That hesitation created the space for the cross that led to the goal.

The first ten minutes after a substitution often expose whether the new shape holds together.

Question: Do you watch the first ten minutes of a half to see if the spacing between units has changed?