Absent a fight at the convention, your hypothesis may not be possible. There are deadlines for getting onto primary ballots. They are fast approaching. Second, to run through the primaries, the yet to be named candidate would have to have a campaign structure and team in place, a ground game and money. They would also have to be resigned to being a one and done candidate because everyone's real polling has Trump winning in a landslide.
Absent a fight at the convention, your hypothesis may not be possible. There are deadlines for getting onto primary ballots. They are fast approaching. Second, to run through the primaries, the yet to be named candidate would have to have a campaign structure and team in place, a ground game and money. They would also have to be resigned to being a one and done candidate because everyone’s real polling has Trump winning in a landslide.
All true with one exception - a brokered convention.
If none of the candidates have enough ballots to win (or if the DNC rigs the results) an outside candidate could be presented to the convention without having to go through the process.