This article is two years old but I think its basic argument still stands. The “five factions” amount to differences between where each faction stands in relation to Trump.
By Perry Bacon, Jr., FiveThirtyEight
When President Trump entered office, it wasn’t clear if he would consolidate control of the Republican Party — or even his own administration. We used to write a lot about various power centers in his administration, for example. But the president gradually forced out people who didn’t agree with him. Congressional Republicans buck the White House on occasion, but that’s more the exception that proves the rule. And special counsel Robert Mueller’s probe ending without the president being directly implicated, according to the attorney general, both removes any doubt that Trump will be running for president in 2020 and gives Republicans skeptical of Trump one less argument to make against him, thereby strengthening his influence within the GOP.