The Prologue successfully does that in regards to all three and I think it would have made for great television if the episode spend more significant time on that aspect of the storyline. The prologue is really a pretty good story and in my view is one of the great chapters of the books. This very short in time attempt is not nearly as good and it is somewhat lacking.
Unfortunately Patchface might have needed to be cut or to just be a not particularly special fool. And their are some inner thoughts that might not be as easy to adapt. But the prologue chapter has great dialogue in it and events that work well and it could had been adapted. Developing Cressen viewing Stannis and Renly as his kids would not be a bad idea either. Maybe the show would add an additional line or two of Cressen saying to Davos (or someone else) how he raised the Baratheons and considers them sons and can't allow Melisandre possibly leading Stannis to kinslaying. So yeah I think through some adjustments it was adaptable, and it is a loss that it wasn't because it would have made for great television. Maybe they didn't do so, because they only have ten episodes and unlike season one in this season there will be more time spend in battle scenes making time for some storylines even more limited than it might have been in general.
ICAM. The Prologue did a great job of setting the scene or tone as to who Davos, Cressen, and Stannis are. I thought we got some of that in later scenes w/Stannis, but not so much Davos and definitely not Cressen.