I've noticed that if I change a DE to OLB, he gets a very lowly 10 current / 10 max in Man Coverage and Zone Coverage. I assume this is because those categories don't exist for DE, so the computer just gives the lowest possible to those categories when that position is changed.
My question, though, for those that have changed DEs into OLBs, is How well do they do overall? OLBs often have to drop back into coverage as well as pass rush. Unless you go through your playbook and sub some players in for coverage schemes, and others for pass rush schemes, it seems like you could get mixed results from switching positions.