Board Thread:General Discussion/@comment-86.46.22.35-20130403153709/@comment-3060460-20150416144326

Adachi Did It wrote: I agree we'll see Liquid and at least hear about Solidus in the game, I just don't think it'll be by having a biologically 2 yr old guarding the world's greatest soldier.

And no I don't believe they do bring up The Sorrow in MGS4 (been a few yrs since I played though), but the fact that Ocelot was apparently being taken over by Liquid does make sense considering his Dad was a spiritual medium. Whether intentional or not. Makes it more impressive imo if that wasn't the starting plan. Sorrow does appear in MGS4 to bring Mantis to the other side.