Hey, Marko, it's fine, cool! 
I fear that you may be missing entirely my point
THis was to show that you didn't need to be optimised to be quite interesting as a teacher to a covenant. Well, he won't be because he's incomprehensible (here, you have your bad teacher!), but that could be changed easily 
I think you can understand that. His other scores mean nothing: Whatever he can teach, a SQ 15 is still better than almost all books and would get him hired.
Say, keep his com and teaching as they are, drop incomprehensible. Give him a bunch of languages, lores, whatever you want, at 05. Would he make a fine teacher for a covenant? Of course.
Now, no problem, a score of 9 can also illustrate what I tried to convey you about draganna: Instead of every teacher being "naturally" a good teacher, just increase the damn skill! 
For what it's worth, for that ain't the point:
- He's about 10 years older than Bashir (I couldn't find any mention of his age, save him being in his 30's).
- Bashir has got an effective score of 8, only one lower.
- His recommended maximum is 10 (8 for age, +2 for affinity), so he's near the max, yet slightly below, on par with the Grizzled Veteran in the corebook (45y, max score of 8 ), only with an affinity on top.
- No one said anything about your scores. In fact, Fightmaster advised taking medecine 09 with a bunch of formulaes. You lowered it to 8
we also all encouraged you to take formulaes
Thing is, yes, he's very good, yes he's pushing it, and could benefit a few more years to have more abilities (or from the andorra rules! That's 13 years worth of XP at the same age!).
But he's not the best. Neither is Bashir, of course, and that's fine!
He's exactly the kind of guys I'd expect to see as one of the best doctors of the scholomance: Highly specialized, intelligent, talented, but not a genius above geniuses.
- Compare him to a companion who's "the best natural magician there is": Simply adding a puissance, and Great Intelligence*2, would give +4 points.
- Compare him to a grog like Jesus: Jesus is 15 years younger and has a 11.
For what it's worth, he was also paid for by build points as a specialist, and has a 15-lines background (say, 9 for bashir, 4 for jesus, 0 for draganna), with a reason to join and pester the covenant, so he's not even as free or nameless as a "let's design a grog to boost us". He's built as a grog, but was conceived with the same investment as a companion