B.B. King is right on this one. Im used to always seeing at least a rating > 12.5 for Yasujiro...when i see him at 11.5, i know that means he was out classes.
Weak ratings are normal and expected in this match. It was many seasons ago when Japan played in Repechages last time, so You could not know.
It is only competitive match in whole 28-weeks schedule when all players have default game shape = 7. In all other  NT games GS is much better (8-9).
Simply put...the salaries on the nt are too small...only 5 salaries over 100k.
There is 6th 100k-ish player however he is SG, so it means he hasn't passing, however he has the best JR of all Japan players. Overall he is weaker than called players (all called guards are PG, I selected players with the best combination of OD+PS).
Here is full list of 36 Japan players with the best salary. 0 players over 200k, only 1 player over 150k, 6 players over 100k and even only 32 players over 50k. I checked all Japan players with salary over 8k and amount of players who can play in NT is very small. And players with worse salary aren't well rounded, so even if I would want to call C with 30k salary and great OD+PS, it's impossible, because they don't exist.
 #.  LINK	AG  PO  BP	SALARY	 NAME
 1. (9632079)	31   9  PF	185 713	 Furusawa
 2. (9632142)	31   9  PG	123 587	 Tagawa
 3. (12180094)	29   8  PG	114 438	 Eguchi
 4. (12180136)	29  10  PG	113 676	 Fujii
 5. (6927944)	33   8  SG	111 258	 Okita
 6. (12180073)	29   7  C	107 831	 Hayakawa
 7. (18297154)	25   8  C	 98 578	 Takayama
 8. (21305788)	23   9  C	 91 387	 Matsumoto
 9. (14003048)	28   8  C	 89 525	 Sonoda
10. (21305663)	23   8  PG	 88 868	 Kawagichi
11. (16975268)	26   8  SG	 87 695	 Saiki
12. (16975286)	26   9  PG	 87 539	 Honda
13. (11001986)	30   9  SG	 85 765	 Ochi
14. (9632182)	31  10  SG	 84 249	 Aida
15. (13597232)	28   8  PG	 79 013	 Ueda
16. (8205619)	32   8  PG	 73 842	 Suenami
17. (4834329)	35   7  C	 70 897	 Kouzuki
18. (19825173)	24  10  C	 70 051	 Yasujiro
19. (9632159)	31   7  PG	 66 570	 Kanagaki
20. (18297126)	25   8  SG	 65 976	 Yokotami
21. (8205684)	33   9  SG	 65 114	 Hojo
22. (11002005)	30   6  C	 62 540	 Takizawa
23. (16975227)	26   6  PF	 61 815	 Shibukji
24. (9632171)	31   7  PG	 60 775	 Hara
25. (15030531)	27   7  SG	 60 410	 Umari
26. (21305594)	23  10  PG	 60 404	 Amori
27. (19990551)	25   9  SG	 56 704	 Asada
28. (16975188)	26   7  PG	 53 533	 Okada
29. (15030544)	27   7  SG	 51 698	 Matsumura
30. (21305793)	23   9  PF	 50 963	 Wakatsuki
31. (21682903)	24   8  PG	 50 453	 Akashi
32. (12180123)	30  10  C	 50 444	 Ochi
33. (11002133)	31   7  SF	 49 492	 Oishi
34. (20314475)	25   9  PF	 48 473	 Asano
35. (16975235)	27   9  SG	 47 989	 Honda
36. (16975255)	26  10  SG	 47 797	 Mizuno