His powers were not just reactive. He was able to use his aura to detect and locate other mutants, althought rarely used it that way. That is half of Caliban's powerset.
He was a great character and it is a shame he has been dead for so long.
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Also, and people does not usually point this out, he was the first black african american character in the X-men. Always found it curious that white characters could be the boy next door but black characters had to be like, a time traveler from the future, a brazilian billionaire or an african goddess. Ev was the first "average kid with powers".
And I think that is important. In the first issues of Gen-X the police threatened his family with taking await their (white and asian) adopted children to another "safer" family (the implication being white) over a burglary at their home. Would have done that, too, if not for Emma mindwiping them both. You would be hard pressed to make that point with Bishop resonating in the same way.
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