From what I can glean from this question, I understand that it is a halachic requirement than when doing Hagbah, the congregation must see the writing (based on Ashkenazic style Hagbah.)
My shul often gets congregants who are not "expert" or knowledgeable Magbi'ot (lifters). This is especially true when the person is a Bar Mitzvah occasion guest. The gabbai feels that he has to give certain people an honor and in lieu of giving the person an aliyah, he gives the person hagbah.
In many cases, the person tells the gabbai directly, "I've never lifted the Torah before, I'm not comfortable doing this." Aand the Gabbai assures him to do it, anyway, people will help. I watch and instruct, but, if the person hasn't done this before, he'll just pick up the Torah completely closed and sit down.
I don't think it's a problem if this is what happens at the end, "accidentally". However, if the Gabbai knows in advance that such people can't do Hagbah properly showing the writing, is he halachically allowed to invites such people?