Coutinho was a big factor for the problems in the first half imo, his role is the most important, its the constant outlet the other 3 midfielders will use, and he constantly gave the ball away and had arguably his worst performance in a red shirt.(To be expected though, brilliant talent just simply experience needed that he will get over time)
Agree though Rodgers tweaked it and got Henderson and Allen closer to Gerrard in the second half that helped.
IMO, the tactics were spot another big call in a growing list from Rodgers that he got right