So, I just read the original Proteus story not too long ago, and in it Moira explicitly thinks its been "twenty" years since she last saw Joe(Proteus/Kevin's father), when he raped her and conceived Kevin, so he was not just "ten" years old. Furthermore, Kevin had weeks on Muir Island alone after Magneto's attack freed him before possessing/killing that boat captain, before his frenzied few days with the X-Men in pursuit(during which he maliciously killed many people, and almost destroyed a whole city). This issue paints Colossus's actions as if he was completely out of line to take him down, when in fact, Piotr only did so as a course of last recourse, in a story that presaged the tragedy of mutant powers gone awry just before the seminal Dark Phoenix saga. Readers who haven't read the original would look at this issue and think the X-Men are horrid child killers(when the vast majority of them are not!).