The Suarez scenario is just because we're comparing first XIs in a World that is now without Suarez. I don't think you've signed anyone who'll step into your first XI ahead of a player you already had.
You'll change your mind when you see us play.
You don't replace Suarez with like for like.
So Rodgers has retooled the side for a new season.
Last season we primarily played 4-diamond- 2 in order to accommodate Suarez and Sturridge.
We know Rodgers prefers 4-3-3 in attack, which needs only one striker. Rodgers has bought players based on what formation(s) we will use this season featuring Sturridge. When teams park the bus, Lambert comes in, so we now have an option. And if we don't have Sturridge, we still have pace across the front three to cause problems. A bit like Barca when they didn't have any strikers and rely on their #10. ( Not that i'm saying we have Messi in our team but that we have loads of players who are versatile and can play across the front three with Coutinho or Lambert directing traffic)
In truth we'll still see the diamond formation, 4-5-1 when we drop back in defense, we'll use 4-4-1-1 at times like we did last season, and 4-2-3-1. Why? Because we have the options, youth and pace, and players to play all those formations. Even without Suarez.