I'm sorry I have to agree with trdyl and Eyebabe. Normally, new growth in a Cattleya comes only from the eyes on the rhizome near the base of a pseudobulb. You will get no new roots from the leaf or portion of the pseudobulb remaining.
However, there may be a one in a million chance of a keiki forming at the base of the leaf. A few species in the Cattleya alliance will very rarely form keikis at the base of a flower spike or where a spike would have started. VERY rarely, and I've never heard of it on a detached leaf. If you saw something written about propagating from pseudobulbs it was probably talking about Dendrobium canes, not Cattleya pseudobulbs.
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