Update on splitting of lifetimes of c and b hyperons within the heavy quark expansion and decays Ξq → Λqπ

It is argued that the results of recent precision measurements by LHCb of the lifetimes of charmed and bottom hyperons are very well consistent with the description within heavy quark expansion and allow to accurately determine matrix elements of light-flavor nonsinglet four-quark operators over the hyperons and to accurately reproduce the difference of lifemes of Λb and Ξb-. When combined with the recent LHCb results on the decay Ξb-→Λbπ- this leads to a prediction of a lower bound on the rate of the decays Ξc→Λcπ.