The Character history template is for main characters or characters who appear in at least three seasons of Community, Magnitude, Leonard and Star-Burns fall into that category. Hickey on the other hand is like Marshall Kane, a character who appears just for that season (it's unlikely should a sixth season of Community occur that he would return since he is already set to reprise his "Breaking Bad" role as "Mike" for a spin-off next year). The Character history on articles like that have a format with just paragraphs accompanied by pictures without the template being used.
On an unrelated note, I believe he is returning to the show, due to the fact that Better Call Saul is filming in May, and Community starts filming in late august-september. He can definately come back in the latter half of the season, since they stop filiming in late december. Also, both shows are owned by Sony, and Vince Gilligan and Dan Harmon are friends and wouldn't want to screw with each other's shows. Dan Harmon expressed a bit of optimisim that he would return to the series.
But again, my mistake. I'm just going to refrain from editing the wiki until I get the hang of what's going on.