前回大洗の時期隊長候補を(寂しかったから)鍛えるつもりで(拉致)西住家に迎えた家元。
※実際は常夫さんが夏休みの間、夏合宿という名目で澤家に許可を得ています。夏休み後半ごろにはウサギさんチームみんな(遊びに)来てます。

The Iemoto brought in (abducted) a potential commander last time she was in Oarai with the intention of training her (because he was lonely), welcoming her to the Nishizumi family.
[nodtext]*[/nodtext] In truth, Tsuneo-san was given permission from the Sawa family under the auspices of it being a summer training camp during summer break. Around the latter half of this period, all of Team Rabbit came over (to play).

Iemoto = head of a school of a particular Japanese art, e.g. tankery.