[thedag]

Just to further clarify. The rules also state a card must specifically say so if it goes against general rules of the game. Since kneepads of Allure do not specifcally state you can get everyone you want to help then the limit of one helper only applies.
The card would just be way too powerful if it guaranteed win every time which is what your friend was suggesting. Any instant combat win cards are all one shots not an ongoing item.