I don't think us getting an early goal will affect their game plan that much. For them a draw is as good as a win in this match and even if they go a goal down i expect them to stick to a counter-attacking system and try and get an equalizer. If we go 2 up though, they will have to open up a bit and thats when we could pounce.
However, the way i see things, if we go up by 2 early on i expect us to score a maximum of one more goal, as i think that with a two goal lead against Ludo, BR will instruct the boys to keep possession and see the game out to claim 3 important points upon our return to the CL.
I think this talk of us scoring 5 is a bit ambitious to be honest. Wouldn't put my money on it, might happen, but not likely IMO.