It's not a bigger priority in Guardiola's eyes, he made that clear at every possible moment. He could not have been more clear all through the season as to what our problem was, scoring goals. In fact, as others have pointed out, we only conceded 2 more last season than we did in 13/14, but we scored 22 fewer goals.
He also detailed plenty of times how he thought we were conceding a lot of those 39 goals because our forwards weren't killing off games when we had the chance.
And then on top of that he's buying 4 defenders and a keeper.
Precisely. And this will absolutely change this upcoming season, I am certain