Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-69.121.172.69-20130820040029/@comment-107.202.182.65-20130820062017

the reason probably peter's alpha form is the most different is because it was season one and the show wanted to show a difference between betas and alphas. to make the alpha look more intimidating as peter was the big bad. then in season two they decided an alpha would just have red eyes and their form would be similar to betas only different eye color.