Kasich and cruz are only there now to do the establishments dirty work and take as many delegates as they can to have their contested convention.
We know it is over for both of them , but they will stay there anyway.
Trump wins because Kasich, Cruz and Little Marco will continue to divide the remaining vote all the way down the stretch.
It's mathematically impossible for him to get enough delegates and I don't think Kasich has a prayer of even having a decent showing in any of the remaining primaries/caucuses. In fact, I don't expect him to even campaign much. His only plan is try and steal the nomination at a contested convention, and the GOPe Fat Cats will keep him funded for that goal.