The best case scenario for Trump is as follows: right before June 7, he will be some 100 delegates short, having to rely on winning in California to make up the difference.
He will have to release his tax returns very soon, and also he will have to testify in the university scam cases, not to mention that he will hit a roadblock at the convention.
Trump is still trying to run as an independent, while using the Republican party as a platform: this means that the GOP had this planned from the very start, a sure sign that they are not about to lose the general election to the Democrats, not to mention the House and Senate elections, by supporting a nominee who will have a hard time getting the needed Hispanic, Black and Catholic votes on his side; something else must be going on.