What real difference does the lsa on a cam make?

So let's play a scenario. You have an engine with 11:1 static CR, but you want to run pump gas. You leave it up to your engine guy to pick the cam to run the fuel without detonation. He picks a cam with .266/.268 duration @ .050 and a 105 LSA. If the lower LSA pumps up cylinder pressure, why would he have chosen that LSA when static CR is already fairly high? I guess it's mostly about dynamic CR? That's what was just ordered for my motor and didn't know much about LSA when he told me. The tech at comp cams and my engine guy came up with that combo. I thought that was pretty tight so I've been trying to read around to find out why that particular setup was chosen. I'll ask him later about it but wanted to hear some thoughts from you guys on that.