Shouldn’t Ron DeSanctus Be Much Closer in Polling If Support for Trump is Only About 50% of Republican Electorate?

Considering Ron DeSantis enjoying a huge establishment media blitz for him is the only potential or announced candidate with a chance to dethrone Trump, and if Trump really is at about 50% support from the Republican electorate, shouldn’t DeSantis be at around 40% in the polling rather than 25%?