Stamp Condition In Souvenir Sheets

Recently, I came across an article talking about the importance of stamp centering vs. the presence of hinge (ie the relative importance of each factor determining the overall value of a particular stamp). The article stressed that, at least for the early US issues, stamp grading (VF, F) is usually a more "important" factor than hinged / never hinged when assessing the value of a stamp. The article also addressed the issue of selvage on a stamp, & that a hinge on the selvage only would not make the stamp a hinged item (which makes sense, for if you were to tear out the selvage, the stamp would be never hinged).

Now I'm thinking about souvenir sheets. What would happen to its value should there be a missing corner? Since the corner is not the stamp per se, but the item's attractiveness would be nonetheless diminished, do you think that a small missing part in a souvenir sheet while keeping the stamps intact should be devalued more than a souvenir sheet without good centering?

I am considering a 1951 souvenir sheet Lady of Fatima. The centering is good, the gum seems to be OG; the only thing is that I notice that one side has about 1mm wide of paper missing halfway (were it missing all the way through, I probably would have never noticed it). How badly should this imperfection affect it's value?

Your insights on the general discussion or my personal issue are welcome! Thanks!