There is no contradiction in the women at the tomb, one has to create it. The accounts are complementary. None of the accounts say that only the women, and none other, were present. The writer for his own reasons chose to mention only certain people. To illustrate my wife and I went to a military dining facility for Thanksgiving dinner. That does not mean I did not take four friends with us, which I did.
Rather than reinventing the wheel here is a harmonization from Tektonics.org
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Here's a sensible reconstruction. Matthew is in red, Luke in blue, John in green. Matthew/Luke equities are in purple. Matthew/John equities are in black. (Mark reports more or less the same thing as Matthew.)
About the ninth hour Jesus cried out in a loud voice, "Eloi, Eloi, lama sabachthani?" which means, "My God, my God, why have you forsaken me?"
When some of those standing there heard this, they said, "He's calling Elijah."
Jesus said, "I am thirsty." A jar of wine vinegar was there, so (i)mmediately one of them ran and got a sponge. He filled it with wine vinegar, put it on a stick, and offered it to Jesus to drink (MT)/ they soaked a sponge in it, put the sponge on a stalk of the hyssop plant, and lifted it to Jesus' lips (JN). The rest said, "Now leave him alone. Let's see if Elijah comes to save him."
When he had received the drink Jesus said, "It is finished." With that, he bowed his head and gave up his spirit. (JN)/And when Jesus had cried out again in a loud voice(MT)/ Jesus called out with a loud voice (LK)/"Father, into your hands I commit my spirit." When he had said this, he breathed his last(LK)/gave up his spirit(MT).
So by reasonably equating John's "giving up" of the spirit with total event of the final cry, the problem is resolved. We need only recognize that John is focusing on what Jesus said that was not shouted publicly - the plea of thirst, the statement of completion, and the turning over of responsibility for Jesus' mother to John. This fits in with his station at the foot of the cross.
http://www.tektonics.org/af/crosswords.php
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And as I have shown here I'm not afraid or reluctant to investigate anything you can post. Every imagined error/contradiction that anyone can point out has been refuted many, many times. Google "Bible contradictions refuted" and see how many hits come back. There were 106,000 in this search alone.