Interesting that Rav Eliashiv has an explicit tshuvah in his sefer if one can lie or exaggerate to make up mayselach of gedolei yisroel in order to inspire talmidim. He frowns upon it, but compares it to a hesped where under very limited conditions one can add some praise to enhance kovod hames (in shulchan oruch).
Parenthetically, the fact that the question was asked him, sheds some light on the Chazon Ish neurosurgery story and possibly quite a few others.