In all heroes, the 2nd skill does not lead to the ultimate ability; I've written a lot about this already. In two heroes, it doesn't even relate to the skill used to upgrade to that ability (and they can still be upgraded to the ultimate ability). In all the others, the skill relates to this "mess," but the "incorrect" ability is already upgraded in it.
м/ф "Ёжик в тумане" качать здесь: http://www.basabas.com/blog/page.php?itemid=1584 .