What Rasmussen's polls shows is precisely what you denied earlier....ie that if the other candidates drop out and its a head to head matchup, the two will split their support evenly. Ultimately, it doesn't matter because Trump is already at nearly 60% as is. Most Right leaning voters don't want to vote for a stiff representative of the RINO Establishment when they have an alternative they were happy with the first time.
That’s not splitting evenly. With other candidates in the race, DeSantis’s vote share is much lower. And, as these things go in the primary, the momentum from picking up votes from departed candidates tends to have inertia.
If Trump were any other person, I think you would be right and he would dominate the RINO lane to victory. But given his defective personality replete with juvenile outbursts, his broken promises andu advanced age, odds are pretty decent that we’ll finally get conservative candidate for president.