I don't know Bladester50, but if I remember correctly in between seasons 1 and 2, their crests were remade again, but they gave them up to make to protect the digital world.
Why can't Patamon and Tailmon go Perfect Level? Might not be Ultimate, but it's better than Adult >_<;;
Sure they don't have their "crests", but at the end of Adventure 01 their crests were in their hearts. = /