I don't think WizKids has ever said why they added numbers to the clicks, but I think the general consensus is that they were added to reduce cheating in the form of over/under clicking. If a character is on click 1 and takes 3 clicks of damage, I can easily look down and see that the character is on click 4 and know that it was clicked properly. This helps reduce those unusual characters you'll face sometimes that somehow have 15 clicks of life. As a side effect, it has also allowed WizKids to introduce interesting new game mechanics like Beast Boys Morph power and Madrox' The Multiple Man. But it hasn't been meant to allow player's to click through a figure during a game to review upcoming powers and to determine which click is best.