Yeah, that's more or less how I see it as well, Thought...though Galactus was a pain in the butt a lot of times...especially what he did to Norrin Radd...he was more evil than you give him credit, I think...but I understand what you mean, I think...anyways!...
It doesn't really make sense for Lavos to randomly help someone...especially if Lavos has any inkling what-so-ever as to the significance of who Lucca is and what Lucca & Co. (doesn't have the same ring as Crono & Co, does it? lol)'s ultimate goal is...The Entity, at least, has motive.