Why didn't Oda Nobunaga do this?
These two had really banged their heads against the city walls before; they knew these castles and rock fortresses were no decorative showpieces. Realizing this now, they began to recall what Harano said earlier, suspecting that the "Nozawa family" might indeed exist independently outside the Oda Danjo Chonosuke system, at least enjoying a great deal of autonomy—Oda Nobunaga couldn't just order them around at will.
So, out of curiosity, Asahina Taisuke sent another envoy, asking Harano to swear he truly wasn't a retainer of Oda Danjo Chonosuke's household. Harano didn't mind, and swore it right in front of the envoy. It happened to be lunchtime, so he even had the envoy take back two grilled fish, once again expressing willingness to coexist peacefully with the Imagawa family.