Sherry came back but she was never killed in the first place <_<Piers has a higher chance of showing up again compared to Steve because we never see him die in the first place.
The fact Steve was never confirmed "dead for good", but rather left with a strong possibility of coming back alive especially by the mouth of someone who himself came back from the dead.Capcom has open ground with Steve. They can easily bring him back and say "Remember when we had Wesker say he might come back?" "We never really killed him off". Sherry had been MIA longer than Steve yet she came back. Steve's return is still easily possible, all Capcom has to do is make a good story for him linking back to the CVX scenario.
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