A costly primary wastes a lot of money and leaves less for Trump in the general election.
I really cannot imagine anyone else winning the nomination.
I would support DeSantis if he were to win the nomination, but I just don't think he can beat Trump.
No, a crowded primary helps Trump secure the nomination against a massive field of "Not Trump" contenders and hurts DeSantis for the same reason.
The Democrats, and Soros alike, want Trump to be the nominee because they're all confident he'd be the easiest to beat. Plus, he'd take the House down with him, they'd hold on to the Senate, and they'd raise boatloads of money running against him.