Interesting article. Gunn clearly states that Baby Groot has no previous memories, it's like he was reborn anew. If the 'original' Groot was willing to die for friends he just barely met, imagine how fiercely loyal this Groot will be with the only family he has memories of!!
I never read GOTG comics so the movies were my introduction to this team (outside of Nebula and Gamora-- they showed up in stuff i read as a kid). So I'm not sure how many years of memories the "original" Groot had- whether or not he had memories of his family (or even if he had one), memories of where he was from, how he came to be- and so on.
Also interesting in the same article Kevin Feige actually contradicts Gunn and says that he has his memories in him in fragments. Makes it sound like they can come back--- but I will overrule this since Gunn basically said the opposite.