That's a fairly accurate summary. Although it is not automatic that it would be winner-take-all, but it does definitely lean that way. A lot of these rules are there to try to wrap things up quickly, ironically, to avoid the intra-party blood-letting we are witnessing. It favors the leader. But they did not count on a leader who is bumbler when it comes to understanding and following rules.
But then, Donald has been ignoring rules his whole life. Now we find out his kids can't vote because they failed to register, the family seems to be a bunch of bumblers when it comes to following the rules. A commonly-seen hazard of being filthy rich is that they begin to think the rules don't matter.
Sur-PRi-ize.
IIRC, the Donald is ahead of the pace Romney was at last time; what people didn't count on was Kasich explicitly staying in long after he'd been skunked everywhere, explicitly to deny Trump Oho (Winner-take-all); and if Trump had got both Florida AND Ohio on the same day, even the megalomaniacal-acting Cruz would've had to drop out.
Speaking of that, people didn't count on TWO people either mathematically eliminated, or all-but-mathematically eliminated, not only staying in the race but openly conniving with sitting party officials to try to slime and cheat and defame their own party's front runner.
Look at the facts, troll-boy.
How many other candidates have have several hundred MILLION in attack ads thrown at them by their own party, and still led the pack?
Oh, come on. That's just sniping.