Some points to noodle on: 1) The emotional side of not wanting to call him a founder is something for you to get over. His title won't matter to you if he hel

Some points to noodle on: 1) The emotional side of not wanting to call him a founder is something for you to get over. His title won't matter to you if he helps you become a billionaire. 2) He's part of your founding team at the very least. 3) 5-10% equity is very generous. More than I'd offer. 4) If he's the right guy, do what it takes within reason to bring him in. If he wants to call himself a founder, let him. The real story is known by you and that should be enough. 5) If you do bring him on board as a founder, you need to internalize it or you'll constantly struggle every time you see his name alongside yours in print or on the site and it will be a source of conflict.