I don't look to months , months are noise, a month at -15% doesn't mean a bad darwin but a low DScore means a bad darwin, a loser that has to be cut.
I dont' trade darwins, the goal is to improve the selection discarding the worst.
Darwins ar not so uncorrelated as I hoped, so it is useless to keep 28 darwins.
I don't blame the trader but if DScore is low some work has to be done to revert, and has to be done out of my portfolio.
In general I look to semesters, semesters are significant for single darwins.