If only past perfect

Point 93 in the category of PAST in the English Grammar Profile has an extremely rare structure with only 1 of each occurrence with nouns and only a few more with pronouns:

1 IF ONLY I HAD N’T BEEN 14
2 IF ONLY HE HAD N’T BEEN 11
3 IF ONLY IT HAD N’T BEEN 7
4 IF ONLY THEY HAD N’T BEEN 6
5 IF ONLY I HAD N’T DONE 4