Do we change the system when Sturridge comes back ?

Same system for me but Danny comes straight back in when ready.

Like most have said I think Raheem could do with a break.

                    Mignolet
         Can         Skrtel         Sakho
Manquillo      Lucas       Hendo       Moreno
            Lallana             Sterling
                      Sturridge

Coutinho, Gerrard, Balotelli all pushing for a place.

You could alternate Sterling and Markovic.

Absolutely. I pretty much see Markovic as coming in for any of Sterling, Lallana, Coutinho with one moving into a central position.

That second formation looks frightening. For more pace, just add Lazar Markovic. 

I've given up on us trying to defend this season

No reason to change the system when where there's so much fluidity in our last game. Don't drop Sterling, eventhough he works at half pace he's gonna take a defender or two with him and free the space for others to move into the opposition box. BR should work with different combos that involves Sterling, Lallana, Cou, Marko, Ballo, Lambert and Sturridge.

If Sturridge isn't due back until end of Jan, we might be in trouble again if he breaks down and it's too late to sign another striker. Then Sterling won't get the break he needs, which could lead to him burning out.
Wouldn't worry about changing the system, be more worried about getting cover while we can.

When Danny is right he comes in for Raheem to give that kid a rest but the system stays as is for me