Cruz is not mathematically eliminated until Trump gets to 1237
That is incorrect, because other candidates currently hold delegates. Some of those delegates could (but have not yet) been released. Also, there are uncommitted delegates.
Unless you expect Cruz to pick up 100% of those in the above paragraph, your statement doesn't work.
The 'pie' is only so big and some others already have slivers of that pie.
Wrong, and you repeating it over and over again. doesn't make it true.
There aren't enough delegates left for Cruz to win realistically.
Unless you think that Cruz is now going to win every delegate left?