The GOP set up the primaries in many places to be winner take all and/or open, thinking that would favor the supposed “moderate” GOPe candidate. What they didn’t count on is someone like Trump, who has appeal to independents and even some Dems as well as conservatives, and is now the frontrunner with a plurality. I think it’s entirely possible Trump will have an outright majority of delegates by the time the convention rolls around.
You will not find independents and democrats as GOP delegates.
You mixing the general election with the nomination process.