Chabadshlucha,
The Rebbe definitely fulfilled the first four: he started the momentous baal teshuva movement as waged the wars of Hashem against assimilation the continuation of which is ongoing by his over 5000 shluchim. And all it takes to qualify is sincere effort, not complete success as that is the first of the conditions for Moshiach vadai
You can’t have it both ways. Did he fulfill it, and there are no longer any non-observant Jews and the enemies of our people are vanquished? Or did he not fulfill it? You can’t say he fulfilled it, but then say he did not, but sincere effort was all that was needed. For me to be a grocery shopper I have to go to the store and shop. I cannot drive halfway there and then be called a grocery shopper because I made a sincere effort to get to the store.