In panel 3 I think its referring to the artist Osatou who first created the OsaYukkuri as in that panel is one of his trademark OsaYukkuri (His are white without any feature other Than that face)
Tani Takashi has every uploaded 4koma being an image response to the first image of the OsaYukkuri
Rapid StrikeThe hunt has......evolved further!!Osa-tros?! I'm not sure what this is referring to...The spoilers... the spoilers are...Niagara!!Please... by all means...Godspeed...Ugh...
Ugggggghhh...#964 Dreams On An Indian Summer