Theoretically you can use fdisk to create a partition on it, and the use mke2fs to create a filesystem.
But there is something strange. You built the raidarray from /dev/sd[abcd]2, and according to /proc/partitions sde has no partitions. That is consistent.
But your 'fdisk -l' shows that /dev/sde *has* partitions, and doesn't show sdd. What does 'fdisk -l /dev/sdd' give?