Board Thread:Questions and Answers/@comment-32617252-20170927011705/@comment-24382493-20170927235125

That total-ish answers your question as your original question is if humans can be killed with simple high reiatsu. Now, can other beings desintigrate humans? They should be able to, the effects of reiatsu is proportionate to the extent of it, so the few chacters comparable to post-Chrysalis Aizen should be able to do similar effects (or even higher effects if they are notably stronger). Of course, this is never shown in-series, as theres no reason for normal humans to be involved in Thousand-Year Blood War arc for them to be desintigrated by the monstruos reiatsu presences there.