Also the Democratic primary rules are much different from the Republican ones. Which is why Trump isn't really a fitting precedent.
Trump won 100% of the delegates in South Carolina with less than 33% of the vote. He won a majority of the delegates in most Super Tuesday states despite not winning a majority in any.
That can't happen under the Democratic rules, and then throw in superdelegates.
It's possible that he'll win the pledged delegates by such a wide margin (say, West 35% Gillibrand 16% Klobuchar 14% Booker 13% S. Brown 12% K. Brown 5%) that superdelegates will hand the nomination to him out of fear of alienating his supporters. It's worth noting that the superdelegates haven't actually gone against the pledged delegate winner yet in their history.