In a way, yes. You get a lot of power by using your lat muscles to bench. Pulling the shoulder blades together as you set yourself up to press allows you to use the back muscles for the push. You may see some PL's lift themselves off the bench by pulling on the bar above them during set up. They are pulling their shoulder blades together and setting themselves back down. You set your arch and shoulder blades together as you set your feet so as to "lock-in" to the position. That way you are set and can take a big breath before the lift off and keep tight for the press. Hope that helps.
My meet is in two weeks, hope to do something good there.
Take care.