Oh wow that was fast lol. Technically yeah nothing was wrong with your edit, but since there's no page yet for the last Invincible issue, it makes for a broken link when you just put the picture in there. And that'd also be fine if you run into some admins who usually don't care (a la moi), but in Invincible's case I'll just make a page for it so the volume doesn't have that problem. I'll make a page for it soon, rn I'm studying for more semester finals but I always take a minute a few times a day to check activity on this wiki. Plus I was planning on creating it on December 19th (day before #143 comes out) anyway for spoiler warnings based on the cover. But thanks for the other edits you've been doing today! The admins here all appreciate it!
Removing links purely because they're redlinks is counterproductive, so I'd say those admins that don't like them are in the wrong, but hey that's just me. And it's no problem! Image Comics have some really great comics, so the wiki deserves to shine!