1) I believe the OT saints were taken to Abraham's bosom, not Heaven, when they physically died.
2) I believe when you see "Sheol" in scripture, you must de-code the meaning as (a) grave, (b) place of discomfort for the unbelieving human spirits, or (c) place of comfort (Abraham's bosom) for the believers.
3) I believe Abraham's bosom is in view, when "the gathering place of the fathers" is mentioned.
4) I believe "Paradise" refers to Heaven, the third heaven, the abode of God, and NOT to the garden of Eden or to Abraham's bosom.
5) I believe no human spirit ascended to Heaven, the abode of God, until Christ died, providing the means of being "made perfect" by the washing of regeneration.
6) When Jesus said the thief would be with Him in Paradise, Jesus was NOT declaring His omnipresence.
7) I believe when Jesus told the thief, today you will be with Me in Paradise, that meant the thief would be made perfect and allowed entry into Heaven on the day of Christ's death.
Christ's physical resurrection on the third day, was not needed to make those God transfers into Christ spiritually, perfect. The mechanism for being made perfect thus allowing entry into Heaven was accomplished by His sacrificial suffering and death on the cross. He resurrection and public appearances for the next 40 days or so, provides additional evidence upon which we can place our faith in His name.