If the assassins were Arab then it would be standard procedure to issue them passports with Israeli names on them, thereby implicating Israel. So the names in themselves only raise further questions. Either the Arabs/Persians/Russians did it and made it look like the work of Israel or Mossad has suddenly become incompetent beyond belief.
Red Cross delivers aid to Taiz, Yemen, for first time since August (Reuters)
from the article: Israel has nothing to worry about over Dubai killing