I don't think Trump cares a rats ass about taking over "leadership" of the Republican party. Controlling them is like herding cats. He owes them nothing and they owe him very little directly. Indirectly they will get blamed, along with him, if nothing gets done and all in the house and a third in the Senate must run in two years. Kind of feet to the fire.
I heard his speech today and he directly smacked down both parties leadership and both of the last two Presidents. Minced no words about getting things done. We have had grid lock for 20 plus years. Time to get back to work. And if you listened he as much as said the K street lobbies and other "think" tank types are not going to have a lot of input or write the bills for a while.
It all about momentum. If he gets a lot done in 30-90 days, even if it is just repealing almost every Obama executive order, it will seem like a avalanche. Repeal Obamacare, in parts and replace it with workable solutions, over the first few months will make opposing him almost too risky for a lot of politicians.
He is a deal maker at heart and will be able to get both sides to agree to somethings like road and bridges being a priority. He wont get it all but 3/4 a loaf is much better than none and that was what Obama settled for. His way or he was happy to see nothing done. He was one of the worst leaders I have ever seen in my lifetime.