I think you mean that it is WS 3 on all those things. I would guess it is a typo. There is no reason an ungro charioteer should be WS 4 instead of 3. GW doesn't do good proofreads over any of the things they put into print. I just recieved my Empire in flames book for mordheim and in the beastman skill chart the number three is there instead of a check mark. I'm sure it was just a font mess but it still should have been caught and not printed as such. I've worked for a printing company and most businesses review the first one off the press to make sure it is what they want.