True, 4th edition does not expressly say whether or not he informed others about Krell. It does indicate that Bruce was very reluctant to interfere with the timeline. The stopping of the 1989 nuclear war was done reluctantly. After Bruce goes and spends two years in the future after that, he comes back even more resolved to not interfere with the timeline ever again and with the desire to know who Krell is. Given that, I would assume he kept all threat data to himself to avoid contaminating the timeline. How bringing back powerful lasers and portable fusion technology does not do that I will conveniently ignore or assume Bruce saw no significant change in the future as a result of bringing those back.
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