It is an open primary, right? So the stats are not necessarily Republican, at least not entirely.
Check the exit poll. Trump won both the conservative and the moderate vote. There was no significant liberal participation.
The Democrats aren't even motivated to vote in their own primaries. You think they actually have the acumen to substantively alter the Republican contest with crossovers?
Desperate fantasy....
The obvious question is, how many crosdover voters are trying to play a game and how many actually intend to vote for Trump? This could be an indication of an iminent Trump general election landslide victory...or not. As the race goes on, it will be more clear.