When the primaries are over there will be a clear winner just like there always is. All the talk of a brokered convention is just that. Talk. Its fun to speculate but will never ever happen.
I don’t expect any brokered convention. I believe the RNC is planning a dictated convention, though.
And to get to that convention, Trump has to do so well,even with all the other conservatives in the running, that he wins at least 8 primaries by more than 50%. If he wins at 49% and the other conservatives split 40% and Kasich and Bush share the remainder, Trump still loses vis a vis Bush and the RNC.