If you had an ounce of working grey matter then you would know that Turkey is unlikely ever to join. Until the country makes sea change after sea change in its policies, it cannot comply with almost none of the EU requirements for joining. Not sure what the significance of Albania is in terms of joining the EU.
If we leave with a no-deal than there will be a hard border in Ireland that will break the terms of the Good Friday Agreement.
I doubt that there is any unity but Boris does not want to break up the Tory because it is likely to be permanent.
Remainers are at one; now, if you think that they are split somehow it's only because some want the referendum result reversed, some want a peoples' vote and some want a General Election but there is no equivalent of a soft, hard or no-deal remain.