Uuuh, i'm very happy that at least someone has answered 
Thanks so far!
Unfortunately the problem with this video is that the attributes of Decimus are already maxed, so it's really no wonder he doesnt gain any additional attributes by lvling up
In my case not all attributes were maxed however. Strength was at 245 points, rest was maxed.
About the damage thing: It is a display bug indeed. I have found a note on freshmeat in the bug list It's harmless as it seems and easy to solve.
(Edit: Actually the bug is also listed in the DSF Bug List in this forum, i didnt notice it before)
Grandfather: Still no idea. Would be great of course if it's possible to find without the requirement to find Shirotachi before or after it (both could make the search harder).
So: 1/3 problems solved.
Thanks so far!
Unfortunately the problem with this video is that the attributes of Decimus are already maxed, so it's really no wonder he doesnt gain any additional attributes by lvling up
In my case not all attributes were maxed however. Strength was at 245 points, rest was maxed.About the damage thing: It is a display bug indeed. I have found a note on freshmeat in the bug list
It's harmless as it seems and easy to solve.(Edit: Actually the bug is also listed in the DSF Bug List in this forum, i didnt notice it before)
Grandfather: Still no idea. Would be great of course if it's possible to find without the requirement to find Shirotachi before or after it (both could make the search harder).
So: 1/3 problems solved.