It doesn’t matter if 4 or 5 people run during the primaries, and divide the Party.
Each of the minor candidates will fall out of the race eventually, after getting 3 or 4 percent of the votes in the primaries. And maybe DeSantis will win 30%. But all that leaves Trump- and only Trump- with the ability to take 51% of the votes at the convention.
And after the convention, the Republican party will no longer be divided. All the R congressmen, senators and governors will shout their full support of Trump.
And 70 million voters will join them.
Can the Dems get 71 million? I doubt it.