Freddy....You may be very interested to read my post on this very subject (the resurrection of the saints at Jesus' death):
http://www.jehovahs-witness.com/12/63386/974023/post.ashx#974023
And also here are two other related posts on the early belief about Jesus being ascending to heaven, or being made alive in the spirit, as he died on the cross:
http://www.jehovahs-witness.com/10/64970/1003158/post.ashx#1003158
http://www.jehovahs-witness.com/10/65283/1011120/post.ashx#1011120
Leolaia