He kinda fits as the logical synthesis of Pence's blandness/obsequious nothingness and the post-J6 rile up the rubes, neo-paleocon isolationism but also crypto white nationalist trajectory of the Republicans.

I thought for awhile that Tim Scott made the most sense as an appeal to being both a relative nobody that'd never upstage Trump and appeal to the religious right and the "Trump's not racist, he has a black VP!" contingent of squishier center-right self identifying Republicans that are looking for an excuse to throw their weight behind Trump that might've sat out 2020 or voted for Biden because of something uncouth Trump said, but that was before the debate debacle and near assassination.

He has it in the bag now and just wants a compatible ideologue that'll never outshine him and will always kiss his ass. It makes perfect sense and completely sucks ass.