Unkoer tagged Shitaya on the upload so I would guess only the last cut is Morioka.

The sourceless credit on sakugawiki only mentions that cut anyways:

6:マギーがねねねをだっこするあたり、アニタが本手にとって読むあたり

https://w.atwiki.jp/sakuga/?cmd=word&word=%E5%AE%88%E5%B2%A1%E8%8B%B1%E8%A1%8C&pageid=605

for what its worth, sakugawiki also presumes that cut to Tetsuya Takeuchi but I don't think it's his work