The comparison of Shotokan and Wado is foolishly done. Master Gigo Funakoshi experimented with attacking from the heel and hitting with the ball(cresent kicking) but left those as options, not as official technique. Grandmaster Gichin Funakoshi and Master Gigo mainly focused on moving and pivoting on the ball for great speed and easier hitting of higher parts as well as lower. The linear stance in most karate(aside from Goju, Kyukushin, and Kempo(Kenpo means law of the sword and is a mistranslation...of course language is weak and abstract...) is the initial stance to emphasize the kick as the primary attack in the attack, defense, or counter of an opponent; the beginning of most combos. Watch Lyoto Machida for example. Machida Karate is a return to the classical values and techniques of original Shotokan. He thrusts from the ball of the foot and when not attacking rests on the heel to conserve energy because it is a sport fight. Where Wado differs is in its greater emphasis on Jujitsu and the wrestling in it that Judo mostly abandoned. Shotokan barrowed more from Judo. Just look at the belt system developed by Grandmaster Jiguro Kano and his friendship with Grandmaster Gichin Funakoshi.