Shanks stops Luffy before he can eat the Gum Gum Fruit! How will that change the outcome of Luffy's life?

What if Dragon didn't leave Luffy to be raised by Garp. What if he was trained by the Revolutionary Army and had access to a different Devil Fruit.

What if Luffy spent his childhood learning how to survive out at sea and how to repair his ship. See a Luffy prepared for life as a pirate as he calculates his moves and gets a larger and stronger crew.