When you say 'extremes', are you referring to 2 extremes, or just the 1 we're familiar with?
To simplify the whole thing, it's like this:
There are 3 groups within the Lubavitch.
1) The Meshichistin. They make up about 1%
2) The Anti Meshichistin. They make up another 1%.
3) The other 98% are the "I Don't Give a Shistim."
/my contribution to deep ideological conversations/flame-wars.