It a very interesting thought of what happened to Jesus in between and if he detached from God! But one place he was is very clear in Luke 23:43 And Jesus said unto him, Verily I say unto thee, To day shalt thou be with me in paradise. So he definitely went to paradise but was there something else he did? It will be a real interesting study! I think the Jesus sacrifice on the cross was completed when he died on it he Matthew 27:46 And about the ninth hour Jesus cried with a loud voice, saying, Eli, Eli, lama sabachthani? that is to say, My God, my God, why hast thou forsaken me? that was probably the time (time of physical death) the father could not look on and the moment of detachment! But as soon as it was done he was victorious and ascended into the spirit realm where is not confined by time & space! However in 1 Peter 3:19 By which also he went and preached unto the spirits in prison; which could also mean that apart from being in Paradise Jesus also proclaimed to those bound in the OT times… so there is a lot to contemplate on!! If that were the case still shows his unfailing love for us even in death! Another point that comes to my mind is the word(bible) is for us the humans, there isn’t data or evidence that I know of but just doesn’t take the possibility that there could be another set plan for those died before NT times without coming to know Christ…!? Even If there was It would not change a thing for us but just go to show his love is unending, during this period of Grace.